Matthew 7:5
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.
1 Corinthians 5:1-6
It has actually been reported [to me] that there is a case of sexual immorality among you that is unheard of, even among the [unconverted] Gentiles. One of you is having sex with his stepmother.
1 Corinthians 5:11-13
But I wrote to you not to associate with anyone claiming to be a [Christian] brother who is [guilty of being] sexually immoral, or greedy, or an idolater, or who speaks abusively, or a drunkard, or a swindler. Do not even eat [a social meal] with such a person.