Numbers 33:4 in the World English Bible
while the Egyptians were burying all their firstborn, whom the LORD had struck among them. The LORD also executed judgments on their gods.
Context
3 And they departed from Rameses in the first month, on the fifteenth day of the first month; on the morrow after the passover the children of Israel went out with an high hand in the sight of all the Egyptians.
4 For the Egyptians buried all their firstborn, which the LORD had smitten among them: upon their gods also the LORD executed judgments.
5 And the children of Israel removed from Rameses, and pitched in Succoth.