Acts 7:58

Stoned. According to the Rabbis, the scaffold to which the criminal was to be led, with his hands bound, was to be twice the size of a man. One of the witnesses was to smite him with a stone upon the breast, so as to throw him down. If he were not killed, the second witness was to throw another stone at him. Then, if he were yet alive, all the people were to stone him until he was dead. The body was then to be suspended till sunset.

A young man [ν ε α ν ι ο υ]. Which, however, gives no indication of his age, since it is applied up to the age of forty - five. Thirty years after Stephen's martyrdom, Paul speaks of himself as the aged (Philippians 1:9).

Saul. The first mention of the apostle to the Gentiles.