Exodus 2:11-13

11Now it came to pass in those days, when Moses was grown, that he went out to his brethren and looked at their burdens. And he saw an Egyptian beating a Hebrew, one of his brethren.

12So he looked this way and that way, and when he saw no one, he killed the Egyptian and hid him in the sand.

13And when he went out the second day, behold, two Hebrew men were fighting, and he said to the one who did the wrong, “Why are you striking your companion?”