Exodus 8:24-26

Darby Translation

²⁴ And Jehovah did so; and there came dog-flies in a multitude into the house of Pharaoh, and [into] the houses of his bondmen; and throughout the land of Egypt, the land was corrupted by the dog-flies.

²⁵ And Pharaoh called Moses and Aaron, and said, Go, sacrifice to your God in the land.

²⁶ And Moses said, It is not proper to do so; for we should sacrifice the abomination of the Egyptians to Jehovah our God: lo, if we sacrificed the abomination of the Egyptians before their eyes, would they not stone us?