Reference for Psalms 34:1

לְדָוִ֗ד בְּשַׁנּוֹת֣וֹ אֶת־טַ֭עְמוֹ לִפְנֵ֣י אֲבִימֶ֑לֶךְ וַֽ֝יְגָרֲשֵׁ֗הוּ וַיֵּלַֽךְ׃

[A Psalm] of David; when he changed his demeanour before Abimelech, who drove him away, and he departed.

ספר השרשים