Shemot 13:1-3

Orthodox Jewish Bible

13 And Hashem spoke unto Moshe, saying,

² Set apart as kodesh unto Me kol bechor, whatsoever openeth the rechem (womb) among the Bnei Yisroel, both of adam and of behemah; it is Mine.

³ And Moshe said unto HaAm, Remember this day, in which ye came out from Mitzrayim, out of the bais avadim; for by chozek yad Hashem brought you out from this place; there shall no chametz be eaten.