Exodus 10:9, 24-26

And Moses said, We will go with our young and with our old; with our sons and with our daughters, with our flocks and with our herds will we go; for we must hold a feast unto Jehovah.

And Pharaoh called unto Moses, and said, Go ye, serve Jehovah; only let your flocks and your herds be stayed: let your little ones also go with you. And Moses said, Thou must also give into our hand sacrifices and burnt-offerings, that we may sacrifice unto Jehovah our God. Our cattle also shall go with us; there shall not a hoof be left behind: for thereof must we take to serve Jehovah our God; and we know not with what we must serve Jehovah, until we come thither.