Exodus 8:24-26

Young's Literal Translation

²⁴ And Jehovah doth so, and the grievous beetle entereth the house of Pharaoh, and the house of his servants, and in all the land of Egypt the land is corrupted from the presence of the beetle.

²⁵ And Pharaoh calleth unto Moses and to Aaron, and saith, `Go, sacrifice to your God in the land;'

²⁶ and Moses saith, `Not right to do so, for the abomination of the Egyptians we do sacrifice to Jehovah our God; lo, we sacrifice the abomination of the Egyptians before their eyes -- and they do not stone us!