Exodus 8:25-27

Young's Literal Translation

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!

²⁷ A journey of three days we go into the wilderness, and have sacrificed to Jehovah our God, as He saith unto us.'