Num Numbers, chapter Book of Numbers, chapter 33
And they journey from Rameses in the first month, on the fifteenth day of the first month; from the day after the Passover the sons of Israel have gone out with a high hand before the eyes of all the Egyptians— and the Egyptians are burying those whom YHWH has struck among them, every firstborn, and YHWH has done judgments on their gods.