Saying, I am the God of thy fathers
Who made a covenant with them, promised the land of Canaan to them, and to their posterity, and to bring the children of Israel out of their servitude and bondage, and into the possession of the promised land:
the God of Abraham, and the God of Isaac, and the God of Jacob;
words which our Lord makes use of to prove the doctrine of the resurrection of the dead, since God is not the God of the dead, but of the living, (See Gill on Matthew 22:32)
Then Moses trembled;
this Stephen had by tradition; in which way also the author of the epistle to the Hebrews had the account of his trembling and quaking at the same mount, when the law was given, ( Hebrews 12:21 )
and durst not behold;
either "the sight" of the burning bush, and curiously consider and inquire into that, as the Syriac version reads; or him, as the Ethiopic version; that is, God, and which is expressed in ( Exodus 3:6 )