Acts 7:23

And when he was full forty years old,.... This Stephen had from tradition, and not from Scripture, which is silent about the age of Moses at this time, and only says, "it came to pass in those days…

Full forty years old - This is not recorded in the Old Testament; but it is a constant tradition of the Jews that Moses was 40 years of age when he undertook to deliver them. Thus, it is said, “Moses…

When he was full forty years old - This was a general tradition among the Jews: "Moses was forty years in Pharaoh's court, forty years in Midian, and forty years he served Israel."

To visit his…

Stephen here goes on to relate,

I. The wonderful increase of the people of Israel in Egypt; it was by a wonder of providence that in a little time they advanced from a family into a nation. 1. It was…

And when he was full forty years old Better, But when he was well-nigh forty years old. The verb in the original intimates that the forty years were just being completed. For the fixing of this time…