תּלמוד אויף תהילים 12:5

Rebbi Yasa in the name of Rebbi Joḥanan: He who calumniates does not speak until he has disowned the principle¹⁵⁵The principle of the Jewish faith, that God is the Ultimate Judge.. What is the reason? (Ps.12:5) “Who said, by our tongues we shall overcome, our lips are with us, who is master over us¹⁵⁶This is a declaration of atheism.?” All sins a person commits on earth, but this one they commit both in heaven and on earth. What is the reason? (Ps.73:9) “They put their mouths in heaven and their tongue wanders about the earth.” Rebbi Isaac said157 (Ps. 50:22): “Understand that, those who are forgetting God, lest He will tear¹⁵⁸In the Biblical text: Lest I shall tear. and nobody may rescue.” Rebbi Joshua ben Levi said (Ps. 50:20): "You sit, talk against your brother, you find fault with your mother’s son.” What is written there? (Ps. 50:16) “God said to the evildoer, what right do you have to speak about My laws, to keep My covenant in your mouth?”