Exodus 2:11-12

11Now it came about in those days, 1when Moses had grown up, that he went out to his 2fellow Hebrews and looked at their 34hard labors; and 5he saw an Egyptian beating a Hebrew, one of his 6fellow Hebrews.

12So he 7looked this way and that, and when he saw that there was no one around, he 8struck and killed the Egyptian, and hid 9his body in the sand.