Acts 7:23 in the World English Bible
But when he was forty years old, it came into his heart to visit his brothers, the children of Israel.
Context
22 And Moses was learned in all the wisdom of the Egyptians, and was mighty in words and in deeds.
23 And when he was full forty years old, it came into his heart to visit his brethren the children of Israel.
24 And seeing one of them suffer wrong, he defended him, and avenged him that was oppressed, and smote the Egyptian: