Proverbs 20:17 - Fraudulent food is sweet to a man, but afterwards his mouth is filled with gravel.
Proverbs 26:24 - 26 - A malicious man disguises himself with his lips, but he harbors evil in his heart. When his speech is charming, don't believe him; for there are seven abominations in his heart. His malice may be concealed by deception, but his wickedness will be exposed in the assembly.
Romans 16:18 - For those who are such don't serve our Lord, Jesus Christ, but their own belly; and by their smooth and flattering speech, they deceive the hearts of the innocent.
Psalms 10:7 - His mouth is full of cursing, deceit, and oppression. Under his tongue is mischief and iniquity.
Jeremiah 9:6 - Your habitation is in the midst of deceit; through deceit they refuse to know me, says Yahweh.