Matthew 7:1-6

Judging (not) others
v.1 Only God has the right to judge, therefore do not judge others or you will be judged yourself. The judgment referred to is deliberately pronouncing someone guilty before God.
v.2 If we engage in such judgment, we will be judged by the same measure that we used to judge. That is, you will be treated as you treat others (nlt).
v.3-5 Possibly drawing on his experience as a carpenter, Jesus here uses the metaphor of a log (or speck) in the eye. The message is that honest evaluation is only possible when we are humbled over our own sins. v.1-5 then warn against the judgmentalism that could result from the high standards taught in the sermon.
v.6 Dogs were considered unclean by the Jewish people. "What is holy" refers to the gospel of the kingdom. So therefore, one must make an evaluation of people to determine their true character and avoid continually witnessing to those who will never receive it. This is perhaps, in balance to v.1-5, a warning against naïveté (the opposite of judgmentalism).

Read Matthew 7:1-6