Acts 7:36

‘This man led them forth, having wrought wonders and signs in Egypt, and in the Red Sea, and in the wilderness forty years.'

And this Moses had revealed himself as ruler and deliverer in performing many signs and wonders both before and after the great deliverance. (The hint was that the One Who had come among them with signs and wonders, both before and after His death, wonders which even they had had to acknowledge, was the greater Moses. It was something that they could hardly fail to recognise).