They forgot God, who saved them, who had done great things in Egypt,

“"They forgat God who saved them" [Psalm 106:21]. How did He save them? "Who did so great things in Egypt: Wondrous works in the land of Ham, and fearful things in the Red Sea" [Psalm 106:22]. The things that are wondrous, are also fearful; for there is no wonder without a certain fear: although these might be called fearful, because they beat down their adversaries, and showed them what they ought to fear.”

“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.”