Commentary for Psalms 78:8

וְלֹ֤א יִהְי֨וּ ׀ כַּאֲבוֹתָ֗ם דּוֹר֮ סוֹרֵ֪ר וּמֹ֫רֶ֥ה דּ֭וֹר לֹא־הֵכִ֣ין לִבּ֑וֹ וְלֹא־נֶאֶמְנָ֖ה אֶת־אֵ֣ל רוּחֽוֹ׃

And might not be as their fathers, A stubborn and rebellious generation; A generation that set not their heart aright, And whose spirit was not stedfast with God.

Rashi on Psalms