Above all else, pray for them and take your lead from God, as the scriptures point out this very issue in different ways, and what should be done.
This is one of those problems, that if not eliminated, a vibrant thriving church will come to it's end.
The children of Israel could have made it to the promised land in 11 days, and 40 years later, because of murmuring and complaining, even their carcasses did not make it out of the wilderness. Of that generation, only Joshua and Caleb crossed the Jordan.
God is never ever pleased with murmuring and complaining. It will cut off God's help and protection because it is an exhibition of unbelief.
Single them out and talk to them.
If this does not work, expose them.
Often it's the one you do not hear saying anything that are the problem... yet you will find them keeping close company with the complainers and jovial about it. Keep your eyes open for talebearers...but you didn't hear that from me (you can laugh now). If somebody busybodies about others business, usually, what they are doing is stirring up strife by turning everybody against each other, which leads to bickering and contentiousness. Those that talk about others are prying for more information to talk about in the sharing of their evil words.
It is devicive and that is what happens. On a lesser scale, members seperate off into groups. On a larger scale, there is wholesale division.
Over the years, this issue has been dealt with according to need.
Most do not realize just how serious this sin is or even recognize it as such. It is the exact opposite of loving your neighbor as yourself.
In the book of James it talks about wars and fightings amongst members through bitter envy and strife. He makes it clear it is self-deception, and that to do such is lying--(against the truth). He also says that the cause is worldly wisdom exhibited through lust. Carnal LUST is the root of this problem.
Paul in Romans 1 says that this problem is at the very root of reprobation: "...because they did not honor God and neither were they thankful..." You see it manifest in these bitter ones by their complaints about everything yet never helping to solve these "things that are soooo wrong." They have a handle on every little problem but are unclear about what to do because of the self-deception.
Over the past two years, there has been little run-in with such, and it is probably due to the way they are put in their place swiftly.
Get to know them on a personal level and confront hypocricy immediately when it is noted.
Some of the 'nicer' things that could be done are whenever there is a complaint made, call them aside with you to pray about the problems; but before you do, ask them if they really believe God has all the answers and that he can change anything that seems to be wrong. (See, murmuring and complaining are in opposition to prayer.)--personally, after this, i'll tell them outright, that they know their prayer assignment now because God would not have revealed the problem(s) to them in the first place if this were not the case. (Prayer changes us more than it does things.)
Find out if they have any prayer requests; because if they don't (for their selfs), you can rest assured their hearts are hardened and only the hammer of God's Word is going to shatter such stone cold heart.
Assign them menial tasks in the church telling them , "we'll start with little problems and needs first and work up from there. This leaves plenty of room for time talking with them when YOU SHARE IN THE TASKS THEY DO.
Sad thing is, these are those who will never be content anywhere and are often further from godliness than a skid row bum. They are so busy complaining they are blind to their own need of our Saviour.
Shakey pillars are easily pushed over, and no congregation needs that kind of support.
Many being called aside and dealt with from the scriptures do repent, yet in time they drift back into old patterns. Those who do repent need to be convert in their ways, and bringing the sciptures related repeatedly to their attention does wonders.
Sermons repeated from various perspectives that relate to needs in this area are never out of date. Some predominant issues relative to this very problem are as follows: inability to give everything to Christ, unforgiveness, laying down your life, anger, lust, wicked imaginations, repentance, carnality, the reprobate, decieving yourself, Ahab, Jezebel, Children of Israel in the wilderness, division, busybodies and talebearers, and so on and on...
It is best to make the issue a non-issue by assault from in front and behind, leaving no room to escape confrontation against faithlessness.
Really, they are trying to get attention, so give them more than they can handle by dealing with them one on one, as well as in their cliche's. Give their busy bodies better things to do.
If they can't stand the heat????
...the problem goes away.
Hebrews tells us that the root of bitterness contaminates the whole.
People who spread unbelief in our God who is more than able are not walking in love, and unity of the faith(ful) is far from their understanding.
They do not just need prayer as this is the spirit of something other than Christ.
Show them their need to change, and how to do it.
Be very patient in this.
Let them see their own need to conform to what the scriptures clearly state.
Proverbs has many aphorisms and axioms appropriate to this issue.
Agapeo,
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Acts 20:332
edited: written too fast to get all the word typed, and it was sent it without checking. (i've gotta' quit doing that!)