And it came to pass in those days, when Moses was grown, that he went out unto his brethren, and looked on their burdens: and he spied an Egyptian smiting an Hebrew, one of his brethren. When Moses was grown - Being full forty years of age, as St. Stephen says, Acts 7:23, it came into his heart to visit his brethren, i.e., he was excited to it by a Divine inspiration; and seeing one of them suffer wrong, by an Egyptian smiting him, probably one of the task-masters, he avenged him and smote - slew, the Egyptian, supposing that God who had given him commission, had given also his brethren to understand that they were to be delivered by his hand; see Acts 7:23-25. Probably the Egyptian killed the Hebrew, and therefore on the Noahic precept Moses was justified in killing him; and he was authorized so to do by the commission which he had received from God, as all succeeding events amply prove. Previously to the mission of Moses to deliver the Israelites, Josephus says, "The Ethiopians having made an irruption into Egypt, and subdued a great part of it, a Divine oracle advised them to employ Moses the Hebrew. On this the king of Egypt made him general of the Egyptian forces; with these he attacked the Ethiopians, defeated and drove them back into their own land, and forced them to take refuge in the city of Saba, where he besieged them. Tharbis, daughter of the Ethiopian king, seeing him, fell desperately in love with him, and promised to give up the city to him on condition that he would take her to wife, to which Moses agreed, and the city was put into the hands of the Egyptians." - Jos. Ant. lib. ii., chap. 9. St. Stephen probably alluded to something of this kind when he said Moses was mighty in deeds as well as words.
Related Commentaries of Exodus 2:11
Exodus 2:11
11 And it came to pass in those days, when Moses was grown, that he went out unto his brethren, and looked on their burdens: and he spied an Egyptian smiting an Hebrew, one of his brethren.