John Gill

They forgat God their Saviour,.... Not only forgat the works of God, Psa 106:13, but forgat God that did those mighty works; forgat that there was a God; or however forgat him that is the only true and living God, when they said of the molten image, "these are thy gods, O Israel"; and what aggravated their crime was, they forgot that God that had saved them in so wonderful a manner out of the hand of their enemies, for his own name's sake; and had led them safely through the Red sea as on dry land, and destroyed those that hated them. Which had done great things in Egypt: meaning the ten plagues on the Egyptians, and the deliverance of the Israelites from them.