Exodus 8:24-26

Revised Standard Version

²⁴ And the Lord did so; there came great swarms of flies into the house of Pharaoh and into his servants’ houses, and in all the land of Egypt the land was ruined by reason of the flies.

²⁵ Then Pharaoh called Moses and Aaron, and said, “Go, sacrifice to your God within the land.” ²⁶ But Moses said, “It would not be right to do so; for we shall sacrifice to the Lord our God offerings abominable to the Egyptians. If we sacrifice offerings abominable to the Egyptians before their eyes, will they not stone us?