חֶלְבָּ֥מוֹ סָּגְר֑וּ פִּ֝֗ימוֹ דִּבְּר֥וּ בְגֵאֽוּת׃
Their gross heart they have shut tight, With their mouth they speak proudly.
Rashi on Psalms
[With] their fat, they closed themselves up With their fat, they closed their heart and their eyes from looking at Your deeds, in fear of You.
Radak on Psalms
With their fat they have enclosed their mouth; they speak proudly. – Their great sleekness has enclosed their mouth. By reason of their great luxury they speak proudly.