"Every believer is to judge him or herself according to the Word of God."
http://school-of-life.net/2019/04/12/10-times-christians-actually-judge-others/
Matthew 7
"Judge not, that you be not judged. For with what judgment you judge, you will be judged; and with the measure you use, it will be measured back to you. And why do you look at the speck in your brother’s eye, but do not consider the plank in your own eye? Or how can you say to your brother, ‘Let me remove the speck from your eye’; and look, a plank is in your own eye? Hypocrite!
First remove the plank from your own eye, and then you will see clearly to remove the speck from your brother’s eye."
Luke 6
"Judge not, and you shall not be judged. Condemn not, and you shall not be condemned. Forgive, and you will be forgiven. Give, and it will be given to you: good measure, pressed down, shaken together, and running over will be put into your bosom. For with the same measure that you use, it will be measured back to you.”
And He spoke a parable to them: “Can the blind lead the blind? Will they not both fall into the ditch? A disciple is not above his teacher, but everyone who is perfectly trained will be like his teacher. And why do you look at the speck in your brother’s eye, but do not perceive the plank in your own eye? Or how can you say to your brother, ‘Brother, let me remove the speck that is in your eye,’ when you yourself do not see the plank that is in your own eye? Hypocrite! First remove the plank from your own eye, and then you will see clearly to remove the speck that is in your brother’s eye."
Luke 12
"I came to send fire on the earth, and how I wish it were already kindled! But I have a baptism to be baptized with, and how distressed I am till it is accomplished! Do you suppose that I came to give peace on earth? I tell you, not at all, but rather division. For from now on five in one house will be divided: three against two, and two against three. Father will be divided against son and son against father, mother against daughter and daughter against mother, mother-in-law against her daughter-in-law and daughter-in-law against her mother-in-law.”
Then He also said to the multitudes, “Whenever you see a cloud rising out of the west, immediately you say, ‘A shower is coming’; and so it is. And when you see the south wind blow, you say, ‘There will be hot weather’; and there is. Hypocrites! You can discern the face of the sky and of the earth, but how is it you do not discern this time?
“Yes, and why, even of yourselves, do you not judge what is right? When you go with your adversary to the magistrate, make every effort along the way to settle with him, lest he drag you to the judge, the judge deliver you to the officer, and the officer throw you into prison. I tell you, you shall not depart from there till you have paid the very last mite.
Too many times a minute, all over the world, Christ's instruction on this subject matter is ripped out of context, warping the intention of Christ with regard to how we are to correctly judge matters, and corrupted for evil purposes, to hide one's own sin.