James 4:11 Do not speak against one another, brethren He who speaks against a brother or judges his brother, speaks against the law and judges the law; but if you judge the law, you are not a doer of the law but a judge of it.
Matthew 7:1 Do not judge so that you will not be judged.
Romans 14:13 Therefore let us not judge one another anymore, but rather determine this-- not to put an obstacle or a stumbling block in a brother's way.
John 8:15 You judge according to the flesh; I am not judging anyone.
Luke 6:37 Do not judge, and you will not be judged; and do not condemn, and you will not be condemned; pardon, and you will be pardoned.
All verses are in the NASB, but if you are interested in other versions www.biblegateway.com is a great source!