A hateful man disguises himself with his speech, but he lays up deceit in his heart.

Psalm 41:6
My visitor speaks falsehood; he gathers slander in his heart; he goes out and spreads it abroad.

Proverbs 10:18
The one who conceals hatred has lying lips, and whoever spreads slander is a fool.

Proverbs 12:20
Deceit is in the hearts of those who devise evil, but the counselors of peace have joy.

Proverbs 23:7
for he is keeping track, inwardly counting the cost. "Eat and drink," he says to you, but his heart is not with you.

Jeremiah 9:4
"Let everyone guard against his neighbor; do not trust any brother, for every brother deals craftily, and every friend spreads slander.

He that hates dissembles with his lips, and lays up deceit within him;