14 Bible Verses about Criticism, amongst believers

Do not complain against one another, brothers, so that you will not [have to] be judged [and condemned for it]. Look, the Judge [i.e., Christ] is standing at the door! [See verse 8].

"Do not pass [condemning] judgment [on other people] so that you do not receive such judgment [on yourselves]. For the way you judge [other people] is the way you [yourselves] will be judged. And the standard you use [for dealing] with others is the standard that they [and God] will use on you. And why do you look for the speck of sawdust in your brother's eye but ignore the board in your own eye?read more.
Or, how can you say to your brother, 'Let me take that speck of sawdust out of your eye,' while there is a board in your own eye? You hypocrite, take the board out of your own eye first; and then you will be able to see clearly enough to take the speck of sawdust out of your brother's eye.

And do not pass [hypocritical] judgment [on other people. See Matt. 7:1-5] and you will not receive such judgment [on yourselves]. And do not condemn [others] and you will not be condemned [yourselves]. Release people [i.e., from guilt for offending you] and you will be released [i.e., by God?] Give [to others] and you will have [things] given to you. People will pour into your lap a full measure [of goods]; it will be pressed down, shaken together and running over [the edges]. Because the standard you use in giving [to others] will be the standard used [by them or God] in giving back to you." Then Jesus told them a parable [i.e., a brief story to illustrate His teaching]: "Can a blind person lead a blind person? Will not both of them fall into a ditch?read more.
The disciple is not more important than his teacher, but when every person becomes complete, [then] he will be like his teacher. And why do you look for the speck of sawdust in your brother's eye but ignore the board in your own eye? Or how can you say to your brother, 'Brother, let me take that speck of sawdust out of your eye,' when you cannot see the board in your own eye? You hypocrite, take the board out of your own eye first; then you will be able to see clearly enough to take out the speck of sawdust that is in your brother's eye.

But you should welcome [into your fellowship] the person whose faith is weak, and not argue [with him] over questionable matters. One person has enough faith that allows him to eat anything [i.e., without it bothering his conscience that the food, such as animal meat, was used in an idolatrous worship ceremony]. But the weak person can eat only vegetables [conscientiously]. The person who can eat anything should not look down on the person who cannot eat [what was used in idolatrous worship]; and the person who cannot eat [such things] should not pass judgment on the person who can. For God accepts that person, too.read more.
Who [do you think] you are, to pass judgment on someone else's household servant? He stands [approved] or falls [into disapproval] before his own Master [only]. Yes, [surely] he will stand [approved], for the Lord is capable of helping him to stand.

Neither should you people complain as some of them did and were killed by the destroying angel [See Ex. 12:23?].

But if you [unlovingly] bite and eat one another [i.e., figuratively], be careful that you do not totally consume one another.

Do everything without complaining and arguing, so that you will be without just blame and innocent [of wrongdoing], children of God without fault in the middle of a crooked and perverted generation of people. You must shine among them like stars lighting up the sky, as you hold out [i.e., offer to people] the message of [never ending] life. Then I will have something to boast about on the day of Christ's [return, See 1:6], that I had not run the race for nothing nor had worked for nothing.

Do not slander one another, brothers, [for] the person who speaks against his brother, or judges him, is [guilty of] speaking against the law [of God]. But when you judge the law, you are not obeying it but acting as its judge. There is only One Lawgiver and Judge [i.e., God or Christ]. It is He who is able to save and destroy [people]. So, who [do you think] you are, judging your neighbor?

Furthermore, one thing required of [good] property managers is that they prove dependable. But it is a small matter for me to be judged by you or by any human court, for I do not [even] judge myself [to be wrong]. For I am not aware of anything [wrong] against myself, but that does not make me right. But the One who judges me is the Lord.read more.
So, do not judge anything until the appointed time, when the Lord returns [i.e., to do the judging]. He will both shed light on the hidden things done in the dark and make known the motives of people's hearts. Then each person [i.e., who deserves it] will receive praise from God.

So, do not allow anyone to judge [i.e., condemn] you for what you eat, or what you drink, or regarding [your non-observance of] a [yearly] festival, or a [monthly] "new moon" observance, or a [weekly] Sabbath day. These things are [only] a shadow of future things, but the body [i.e., the real substance of things] belongs to Christ. [Note: The idea here is that the ritual observances of the Mosaic law were like shadows pointing to the reality of life in Christ]. Do not allow anyone, who delights in acting humble [i.e., living an ascetic life] and who worships angels, to rob you of your reward [in heaven]. [Note: This "angel worship" could mean holding angels in high regard because of their role as God's messengers, or the claim that God can be approached only through angelic intermediaries]. He places great importance on what he [claims to] see [i.e., visions], being inflated with pride by his fleshly mind for no [good] reason.

"And if your brother sins against you, go and show him where he wronged you, [but] keep it between just the two of you. If he listens to you [i.e., accepts your reasoning and repents], you have won your brother [back].

[We made this arrangement] to avoid anyone blaming us for the way we handled this generous gift. For we take measures to do what is honorable, not only in the sight of the Lord, but also in the sight of people.

In everything [you do], you should show that you are a [proper] example of doing good deeds. In your teaching show integrity, dignity, and sound speech that cannot be condemned, so that the person who opposes [us] will have to be ashamed for not having anything bad to say about us.

But you [i.e., probably an objecting Jew] will say to me, "Why does God still find fault [with people]? For who can [successfully] resist what God wants to do?" But who [do you think] you are, [you mere] man, to [attempt a] reply to God? Will the object formed [i.e., a clay pot] say to the one who molded it "Why did you make me this way?" Or, does not the potter have the right to make what he wants to out of the clay? Can he not make both a beautiful vase and a common pot out of the same lump [of clay]?