Reference for Psalms 13:6

וַאֲנִ֤י ׀ בְּחַסְדְּךָ֣ בָטַחְתִּי֮ יָ֤גֵ֥ל לִבִּ֗י בִּֽישׁוּעָ֫תֶ֥ךָ אָשִׁ֥ירָה לַיהוָ֑ה כִּ֖י גָמַ֣ל עָלָֽי׃

But as for me, in Thy mercy do I trust; My heart shall rejoice in Thy salvation. I will sing unto the LORD, Because He hath dealt bountifully with me.

ספר השרשים