Reference for Psalms 136:6

לְרֹקַ֣ע הָ֭אָרֶץ עַל־הַמָּ֑יִם כִּ֖י לְעוֹלָ֣ם חַסְדּֽוֹ׃

To Him that spread forth the earth above the waters, For His mercy endureth for ever.

ספר השרשים