Matthew 18:6

18:6 “But if anyone causes one of these little ones who believe in me to sin, it would be better for him to have a huge millstone hung around his neck and to be drowned in the open sea.

Matthew 23:15

23:15 “Woe to you, experts in the law and you Pharisees, hypocrites! You cross land and sea to make one convert, and when you get one, you make him twice as much a child of hell as yourselves!