Reference for Psalms 18:15

וַיִּשְׁלַ֣ח חִ֭צָּיו וַיְפִיצֵ֑ם וּבְרָקִ֥ים רָ֝ב וַיְהֻמֵּֽם׃

And He sent out His arrows, and scattered them; and He shot forth lightnings, and discomfited them.

ספר השרשים