Reference for Psalms 114:8

הַהֹפְכִ֣י הַצּ֣וּר אֲגַם־מָ֑יִם חַ֝לָּמִ֗ישׁ לְמַעְיְנוֹ־מָֽיִם׃

Who turned the rock into a pool of water, The flint into a fountain of waters.