Psalm 105 calls the congregation to remember all the great things God had done for the descendants of Abraham.    Isaac, Jacob, Joseph, Moses and Aaron are all mentioned, plus most of the plagues, the cloud by day and fire by night, the quail explosion, manna every morning, and water from a rock.

Verses 37-38 are right at the critical juncture of leaving Egypt:

                “Then he brought out Israel with silver and gold,

                 and there was none among his tribes who stumbled.

                 Egypt was glad when they departed,

                for dread of them had fallen upon it.”

The account in Exodus 12.33-36 paints a picture of the conflict in the hearts of the Egyptians.  They were positively disposed toward the Israelites, because “the LORD had given the people favor in their sight.” So they gave away whatever the Hebrews asked for. 

At the same time, they were afraid of the Israelites’ God, and “were urgent with the people to send them out of the land in haste for they said, ‘We shall all be dead.’”

So God was operating on both sides of the Egyptians’ mental conflict.  As the psalm says, the dread had fallen upon them.   The Israelites walked away, encouraged and enriched, because God was at work.