Exodus 8:25-27

Then Pharaoh called for Moses and Aaron, and said, “Go, sacrifice to your God in the land.” And Moses said, “It is not right to do so, for we would be sacrificing the abomination of the Egyptians to the LORD our God. If we sacrifice the abomination of the Egyptians before their eyes, then will they not stone us? We will go three days’ journey into the wilderness and sacrifice to the LORD our God as He will command us.”