From considering certain passages of Scripture, there seems to be a distinction between habitual, willful rebellion against God, and "falling" into certain sins of which one immediately repents when confronted and convicted of those sins.
As a basis, I will post two passages of Scripture that deal with this, and then Matthew Henry's take on them since I found it to provide good insight.
"22 'If you sin unintentionally, and do not observe all these commandments which the Lord has spoken to Moses-- 23 all that the Lord has commanded you by the hand of Moses, from the day the Lord gave commandment and onward throughout your generations-- 24 then it will be, if it is unintentionally committed, without the knowledge of the congregation, that the whole congregation shall offer one young bull as a burnt offering, as a sweet aroma to the Lord, with its grain offering and its drink offering, according to the ordinance, and one kid of the goats as a sin offering. 25 So the priest shall make atonement for the whole congregation of the children of Israel, and it shall be forgiven them, for it was unintentional; they shall bring their offering, an offering made by fire to the Lord, and their sin offering before the Lord, for their unintended sin. 26 It shall be forgiven the whole congregation of the children of Israel and the stranger who dwells among them, because all the people did it unintentionally. 27 'And if a person sins unintentionally, then he shall bring a female goat in its first year as a sin offering. 28 So the priest shall make atonement for the person who sins unintentionally, when he sins unintentionally before the Lord, to make atonement for him; and it shall be forgiven him. 29 You shall have one law for him who sins unintentionally, for him who is native-born among the children of Israel and for the stranger who dwells among them. 30 'But the person who does anything presumptuously, whether he is native-born or a stranger, that one brings reproach on the Lord, and he shall be cut off from among his people. 31 Because he has despised the word of the Lord, and has broken His commandment, that person shall be completely cut off; his guilt shall be upon him.'"-Numbers 15:22-31
"26 For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, 27 but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries."-Hebrews 10:26-27
Matthew Henry on Numbers 15:22-29
Verses 22-29
"We have here the laws concerning sacrifices for sins of ignorance; the Jews understand it of idolatry, or false worship, through the error of their teachers. The case here supposed is that they had not observed all these commandments, v. 22, 23. If they had failed in the offerings of their acknowledgment, and had not brought them according to the law, then they must bring an offering of atonement, yea, though the omission had been through forgetfulness or mistake. If they failed in one part of the ceremony, they must make it up by the observance of another part, which was in the nature of a remedial law. 1. The case is put of a national sin, committed through ignorance, and become customary through a vulgar error (v. 24)—the congregation, that is, the body of the people, for so it is explained (v. 25): All the congregation of the children of Israel. The ceremonial observances were so numerous, and so various, that, it might easily be supposed, some of them by degrees would be forgotten and disused, as particularly that immediately before concerning the heave-offering of their dough: now if, in process of time, upon consulting the law, there should appear to have been a general neglect of that or any other appointment, then a sacrifice must be offered for the whole congregation, and the oversight shall be forgiven (v. 25, 26) and not punished, as it deserved, with some national judgment. The offering of the sacrifice according to the manner, or ordinance, plainly refers to a former statute, of which this is the repetition; and the same bullock which is there called a sin-offering (Lev. 4:13, 21) is here called a burnt-offering (v. 24), because it was wholly burnt, though not upon the altar, yet without the camp. And here is the addition of a kid of the goats for a sin-offering...Thus atonement shall be made for the soul that sins, when he sins through ignorance, v. 28. Observe, (1.) Sins committed ignorantly need to have atonement made for them; for, though ignorance will in a degree excuse, it will not justify those that might have known their Lord's will and did it not. David prayed to be cleansed from his secret faults, that is, those sins which he himself was not aware of, the errors he did not understand, Ps. 19:12. (2.) Sins committed ignorantly shall be forgiven, through Christ the great sacrifice, who, when he offered up himself once for all upon the cross, seemed to explain the intention of his offering in that prayer, Father, forgive them, for they know not what they do. And Paul seems to allude to this law concerning sins of ignorance (1 Tim. 1:13), I obtained mercy, because I did it ignorantly and in unbelief. And it looked favorable upon the Gentiles that this law of atoning for sins of ignorance is expressly made to extend to those who were strangers to the commonwealth of Israel (v. 29), but supposed to be proselytes of righteousness. Thus the blessing of Abraham comes upon the Gentiles.
Verses 30-36
Here is, I. The general doom passed upon presumptuous sinners. 1. Those are to be reckoned presumptuous sinners that sin with a high hand, as the original phrase is (v. 30), that is, that avowedly confront God's authority, and set up their own lust in competition with it, that sin for sinning-sake, in contradiction to the precept of the law, and in defiance of the penalty, that fight against God, and dare him to do his worst; see Job 15:25. It is not only to sin against knowledge, but to sin designedly against God's will and glory. 2. Sins thus committed are exceedingly sinful. He that thus breaks the commandment, (1.) Reproaches the Lord (v. 30); he says the worst he can of him, and most unjustly. The language of presumptuous sin is, "Eternal truth is not fit to be believed, the Lord of all not fit to be obeyed, and almighty power not fit to be either feared or trusted.'' It imputes folly to Infinite Wisdom, and iniquity to the righteous Judge of heaven and earth; such is the malignity of willful sin. (2.) He despises the word of the Lord, v. 31. There are those who, in many instances, come short of fulfilling the word, and yet have a great value for it, and count the law honorable; but presumptuous sinners despise it, thinking themselves too great, too good, and too wise, to be ruled by it. What is the Almighty that we should serve him? Whatever the sin itself is, it is contumacy that incurs the anathema. It is rebellion added to the sin that is as witch-craft, and stubbornness as idolatry. 3. The sentence passed on such is dreadful. There remains no sacrifice for those sins; the law provided none: That soul shall be cut off from among his people (v. 30), utterly cut off (v. 31); and that God may be for ever justified, and the sinner for ever confounded, his iniquity shall be upon him, and there needs no more to sink him to the lowest hell. Thus the Jewish doctors understand it, that the iniquity shall cleave to the soul, after it is cut off, and that man shall give an account of his sin at the great day of judgment. Perhaps the kind of offence might be such as did not expose the offender to the censure of the civil magistrate, but, if it was done presumptuously, God himself would take the punishment of it into his own hands, and into them it is a fearful thing to fall. In the New Testament we find the like sentence of exclusion from all benefit by the great sacrifice passed upon the blasphemy against the Holy Ghost, and a total apostasy from Christianity."
Matthew Henry on Hebrews 10:26-27
"the description he gives of the sin of apostasy. It is sinning willfully after we have received the knowledge of the truth, sinning willfully against that truth of which we have had convincing evidence. This text has been the occasion of great distress to some gracious souls; they have been ready to conclude that every willful sin, after conviction and against knowledge, is the unpardonable sin: but this has been their infirmity and error. The sin here mentioned is a total and final apostasy, when men with a full and fixed will and resolution despise and reject Christ, the only Saviour,—despise and resist the Spirit, the only sanctifier,—and despise and renounce the gospel, the only way of salvation, and the words of eternal life; and all this after they have known, owned, and professed, the Christian religion, and continue to do so obstinately and maliciously. This is the great transgression: the apostle seems to refer to the law concerning presumptuous sinners, Num. 15:30, 31. They were to be cut off.
2. From the dreadful doom of such apostates. (1.) There remains no more sacrifice for such sins, no other Christ to come to save such sinners; they sin against the last resort and remedy. There were some sins under the law for which no sacrifices were provided; but yet if those who committed them did truly repent, though they might not escape temporal death, they might escape eternal destruction; for Christ would come, and make atonement. But now those under the gospel who will not accept of Christ, that they may be saved by him, have no other refuge left them. (2.) There remains for them only a certain fearful looking for of judgment, v. 27. Some think this refers to the dreadful destruction of the Jewish church and state; but certainly it refers also to the utter destruction that awaits all obstinate apostates at death and judgment, when the Judge will discover a fiery indignation against them, which will devour the adversaries; they will be consigned to the devouring fire and to everlasting burnings. Of this destruction God gives some notorious sinners, while on earth, a fearful foreboding in their own consciences, a dreadful looking for it, with a despair of ever being able either to endure or escape it."
