I think the concept of not judging someone else is fairly well established.
Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again. And why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye? Or how wilt thou say to thy brother, Let me pull out the mote out of thine eye; and, behold, a beam is in thine own eye? Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother's eye.
- Matthew 7:1-5 (KJV)
The only person who can judge, is the lawgiver Himself.
There is one lawgiver, who is able to save and to destroy: who art thou that judgest another?
- James 4:12 (KJV)
God is quite clear that we should pray and reach out to people for as long as possible.
Therefore judge nothing before the time, until the Lord come, who both will bring to light the hidden things of darkness, and will make manifest the counsels of the hearts: and then shall every man have praise of God.
- 1 Corinthians 4:5 (KJV)