Acts 7:22-25

And Moses was instructed in all the wisdom of the Egyptians; and he was mighty in his words and works. But when he was well-nigh forty years old, it came into his heart to visit his brethren the children of Israel. And seeing one of them suffer wrong, he defended him, and avenged him that was oppressed, smiting the Egyptian: and he supposed that his brethren understood that God by his hand was giving them deliverance; but they understood not.