Exodus 10:24 DBY

²²  And Moses stretched out his hand toward the heavens; and there was a thick darkness throughout the land of Egypt three days:

²³  they saw not one another, neither rose any from his place, for three days. But all the children of Israel had light in their dwellings.

²⁴  And Pharaoh called Moses and said, Go, serve Jehovah; only, let your flocks and your herds remain; let your little ones also go with you.

²⁵  And Moses said, Thou must give also sacrifices and burnt-offerings into our hands, that we may sacrifice to Jehovah our God.

²⁶  Our cattle also must go with us: there shall not a hoof be left behind; for we must take thereof to serve Jehovah our God; and we do not know with what we must serve Jehovah, until we come there.