Albert Barnes Commentary 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." — Acts 7:36 (ASV)

Wonders and signs: Miracles, and remarkable interpositions of God. (See Barnes on Acts 2:22).

In the land of Egypt: By the ten plagues, Exodus 4-12.

In the Red sea: Dividing it, and conducting the Israelites in safety, and overthrowing the Egyptians, Exodus 13.

In the wilderness: During their forty years' journey to the promised land. The wonders or miracles were, providing them with manna daily; with flesh in a miraculous manner; with water from the rock, etc., Exodus 16 and 17.