Exodus 10:24-29

24And Pharaoh called unto Moses, and said, Go ye, serve Yhwh; only let your flocks and your herds be stayed: let your little ones also go with you. 25And Moses said, Thou must give us also sacrifices and burnt offerings, that we may sacrifice unto Yhwh our God.1 26Our cattle also shall go with us; there shall not an hoof be left behind; for thereof must we take to serve Yhwh our God; and we know not with what we must serve Yhwh, until we come thither.

27But Yhwh hardened Pharaoh’s heart, and he would not let them go. 28And Pharaoh said unto him, Get thee from me, take heed to thyself, see my face no more; for in that day thou seest my face thou shalt die. 29And Moses said, Thou hast spoken well, I will see thy face again no more.