Num Numbers, chapter Book of Numbers, chapter 33
They traveled from Rameses in the first month, on the fifteenth day of the first month; on the next day after the Passover, the children of Israel went out with a high hand in the sight of all the Egyptians, while the Egyptians were burying all their firstborn, whom Yahweh had struck among them. Yahweh also executed judgments on their gods.