Are you familiar wit the story of Moses from the book of Exodus? Stephen did a good job of summing it up here in Acts, but I recommend you reading the whole book some time. There is a lot more detail when you ready it first hand.
I noticed a detail between the two stories that I thought was interesting, but it is totally off topic from the point of Stephen’s speech so I’ll mention it in the comment section later if you are interested.
In regards to Stephen’s speech, he is defending himself against the accusation that he was “speaking words of blasphemy against Moses and against God.” (6:11) Moses was highly regarded by the Jewish people, so they may have been hypersensitive to anything negative said about Moses. Yet, Stephen wasn’t speaking blasphemous words against Moses, he was reminding his accusers of information they already knew…Moses with all his short comings was the first to admit he wasn’t the redeemer but, “God will send you a prophet like me from your own people” (7:37) Stephen’s accusers should have been familiar with that verse found in Deuteronomy 18:15.
Obviously, some people don’t want to be reminded of things they ‘should’ know. The reality of Stephen’s defense is that he proved he was not speaking words of blasphemy against Moses, but words of accusation against his accusers.
Interestingly, Peter quoted the same scripture about Moses when he was talking with a group of Jewish people who witnessed the healing of the crippled guy (ch. 3). He went on to quote Moses farther than Stephen did, “..you must listen to everything he (the prophet, Jesus) tells you. Anyone who does not listen to him will be completely cut off from among his people.” (Acts 3:23 & Deut. 18:19)😳