כִּ֤י אֵ֪ין בְּפִ֡יהוּ נְכוֹנָה֮ קִרְבָּ֪ם הַ֫וּ֥וֹת קֶֽבֶר־פָּת֥וּחַ גְּרוֹנָ֑ם לְ֝שׁוֹנָ֗ם יַחֲלִֽיקוּן׃
װאָרום ניטאָ אין זײער מױל קײן ריכטיקײט, זײער אינגעװײד איז אַן אונטערגאַנג, אַן אָפֿענער קבֿר איז זײער קעל;זײער צונג מאַכן זײ גלאַט.
Rashi
For there is no sincerity in his mouth They appear as friends but they are enemies.
Radak
For there is nothing straightforward in his mouth: – That is the reason why he says because of my watchful foes, for they are men of such a kind that there is no straightforwardness in the mouth (even) of one of them, but they make themselves appear to be friends.
Rashi
their throat is an open grave to swallow others’ toil, like a grave that swallows up the body.