Commentary for Psalms 78:37
וְ֭לִבָּם לֹא־נָכ֣וֹן עִמּ֑וֹ וְלֹ֥א נֶ֝אֶמְנ֗וּ בִּבְרִיתֽוֹ׃
For their heart was not stedfast with Him, Neither were they faithful in His covenant.
Rashi on Psalms
Their heart was not sincere as with their mouth.
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