Shemot 10:25-27

Orthodox Jewish Bible

²⁵ And Moshe said, Thou must give us also zevakhim and olot, that we may sacrifice unto Hashem Eloheinu.

²⁶ Also mikneinu shall go with us; there shall not a hoof be left behind; for thereof must we take to serve Hashem Eloheinu; and we know not with what we must serve Hashem, until we come to there.

²⁷ But Hashem hardened lev Pharaoh, and he would not let them go.