Acts 7:22-25

So Moses was educated in all the wisdom and culture of the Egyptians, and he was a man of power in words and deeds. But when he reached the age of forty, it came into his heart to visit his brothers, the sons of Israel. And when he saw one [of them] being treated unfairly, he defended the oppressed man and avenged him by striking and killing the Egyptian. He expected his countrymen to understand that God was granting them freedom through him [assuming that they would accept him], but they did not understand.