When Moses was forty years old, he decided to visit his brothers, the children of Israel.
23. When the time was fulfilled. Many gather by this that Moses was never estranged in mind from his nation; but the words of Stephen incline rather toward the contrary, to wit, that the Spirit of God did at length awake his mind, as it were out of sleep, that he might at length go visit his brethren, whom he had long time neglected.
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 when the time of the promise drew nigh - the time when they were to be formed into a people.
Commenting on Acts 7:17-29
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 when Moses was grown", Exo 2:11 but that he was at this time at such an age, is the general sense of the Jews.