Proverbs 26:25-28

²⁵When he says fair words, have no belief in him; for in his heart are seven evils:

²⁶Though his hate is covered with deceit, his sin will be seen openly before the meeting of the people.

²⁷He who makes a hole in the earth will himself go falling into it: and on him by whom a stone is rolled the stone will come back again.

²⁸A false tongue has hate for those who have clean hearts, and a smooth mouth is a cause of falling.