Matthew 5:47

5:47 And if you only greet your brothers, what more do you do? Even the Gentiles do the same, don’t they?

Matthew 6:7

6:7 When you pray, do not babble repetitiously like the Gentiles, because they think that by their many words they will be heard.

Matthew 18:17

18:17 If he refuses to listen to them, tell it to the church. If he refuses to listen to the church, treat him like a Gentile or a tax collector.