Translation:

42. (The command was given:) "Strike with thy foot: here is (water) wherein to wash cool and refreshing and (water) to drink."

Notes (Tafseer)

4200. The recuperative process having begun, he was commanded to strike the earth or a rock with his foot, and a fountain or fountains gushed forth,-to give him a bath and clean his body; to refresh his spirits; and to give him drink and rest. This is a fresh touch, not mentioned in S. xxi. or in the Book of Job, but adding beautifully to our realisation of the picture.