Reference for Psalms 103:11

כִּ֤י כִגְבֹ֣הַּ שָׁ֭מַיִם עַל־הָאָ֑רֶץ גָּבַ֥ר חַ֝סְדּ֗וֹ עַל־יְרֵאָֽיו׃

For as the heaven is high above the earth, So great is His mercy toward them that fear Him.

ספר השרשים