from Matthew Henry's Commentary:
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Yet there are some difficult questions that do arise upon this story which have very much employed the pens of learned men. I will say but little respecting them, because Mr. Poole has discussed them very fully in his English annotations.
(1.) It is hard to say what Jephthah did to his daughter in performance of his vow. [1.] Some think he only shut her up for a nun, and that it being unlawful, according to one part of his vow (for they make it disjunctive), to offer her up for a burnt-offering, he thus, according to the other part, engaged her to be the Lord’s, that is, totally to sequester herself from all the affairs of this life, and consequently from marriage, and to employ herself wholly in the acts of devotion all her days. That which countenances this opinion is that she is said to bewail her virginity (Jdg. 11:37, 38) and that she knew no man, Jdg. 11:39. But, if he sacrificed her, it was proper enough for her to bewail, not her death, because that was intended to be for the honour of God, and she would undergo it cheerfully, but that unhappy circumstance of it which made it more grievous to her than any other, because she was her father’s only child, in whom he hoped his name and family would be built up, that she was unmarried, and so left no issue to inherit her father’s honour and estate; therefore it is particularly taken notice of (Jdg. 11:34) that besides her he had neither son nor daughter. But that which makes me think Jephthah did not go about thus to satisfy his vow, or evade it rather, is that we do not find any law, usage, or custom, in all the Old Testament, which does in the least intimate that a single life was any branch or article of religion, or that any person, man or woman, was looked upon as the more holy, more the Lord’s, or devoted to him, for living unmarried: it was no part of the law either of the priests or of the Nazarites. Deborah and Huldah, both prophetesses, are both of them particularly recorded to have been married women. Besides, had she only been confined to a single life, she needed not to have desired these two months to bewail it in: she had her whole life before her to do that, if she saw cause. Nor needed she to take such a sad leave of her companions; for those that are of that opinion understand what is said in Jdg. 11:40 of their coming to talk with her, as our margin reads it, four days in a year. Therefore, [2.] It seems more probable that he offered her up for a sacrifice, according to the letter of his vow, misunderstanding that law which spoke of persons devoted by the curse of God as if it were to be applied to such as were devoted by men’s vows (Lev. 27:29; None devoted shall be redeemed, but shall surely be put to death), and wanting to be better informed of the power the law gave him in this case to redeem her. Abraham’s attempt to offer up Isaac perhaps encouraged him, and made him think, if God would not accept this sacrifice which he had vowed, he would send an angel to stay his hand, as he did Abraham’s. If she came out designedly to be made a sacrifice, as who knows but she might? perhaps he thought that would make the case the plainer. Volenti non sit injuria””No injury is done to a person by that to which he himself consents. He imagined, it may be, that where there was neither anger nor malice there was no murder, and that his good intention would sanctify this bad action; and, since he had made such a vow, he thought better to kill his daughter than break his vow, and let Providence bear the blame, that brought her forth to meet him.
(2.) But, supposing that Jephthah did sacrifice his daughter, the question is whether he did well. [1.] Some justify him in it, and think he did well, and as became one that preferred the honour of God before that which was dearest to him in this world. He is mentioned among the eminent believers who by faith did great things, Heb. 11:32. And this was one of the great things he did. It was done deliberately, and upon two months’ consideration and consultation. He is never blamed for it by any inspired writer. Though it highly exalts the paternal authority, yet it cannot justify any in doing the like. He was an extraordinary person. The Spirit of the Lord came upon him. Many circumstances, now unknown to us, might make this altogether extraordinary, and justify it, yet not so as that it might justify the like. Some learned men have made this sacrifice a figure of Christ the great sacrifice: he was of unspotted purity and innocency, as she a chaste virgin; he was devoted to death by his Father, and so made a curse, or an anathema, for us; he submitted himself, as she did, to his Father’s will: Not as I will, but as thou wilt. But, [2.] Most condemn Jephthah; he did ill to make so rash a vow, and worse to perform it. He could not be bound by his vow to that which God had forbidden by the letter of the sixth commandment: Thou shalt not kill. God had forbidden human sacrifices, so that it was (says Dr. Lightfoot) in effect a sacrifice to Moloch. And, probably, the reason why it is left dubious by the inspired penman whether he sacrificed her or no was that those who did afterwards offer their children might not take any encouragement from this instance. Concerning this and some other such passages in the sacred story, which learned men are in the dark, divided, and in doubt about, we need not much perplex ourselves; what is necessary to our salvation, thanks be to God, is plain enough.
