Psalms 17:10 Midrash

חֶלְבָּ֥מוֹ סָּגְר֑וּ פִּ֝֗ימוֹ דִּבְּר֥וּ בְגֵאֽוּת׃

Their gross heart they have shut tight, With their mouth they speak proudly.

Read midrashic interpretation of Psalms 17:10: and classical rabbinic exegesis.