Exodus 8:24-26

Amplified Bible, Classic Edition

²⁴ And the Lord did so; and there came heavy and oppressive swarms [of bloodsucking gadflies] into the house of Pharaoh and his servants’ houses; and in all of Egypt the land was corrupted and ruined by reason of the great invasion [of gadflies].

²⁵ And Pharaoh called for Moses and Aaron, and said, Go, sacrifice to your God [here] in the land [of Egypt].

²⁶ And Moses said, It is not suitable or right to do that; for the animals the Egyptians hold sacred and will not permit to be slain are those which we are accustomed to sacrifice to the Lord our God; if we did this before the eyes of the Egyptians, would they not stone us?