Shemot 12:13-15

Orthodox Jewish Bible

¹³ And the dahm shall be for you, an ot (sign) upon the batim (houses) where ye are; and when I see the dahm, oofasachti (then I will pass over, skip, spare) you [plural], and the negef (plague, blow, striking, i.e., death of firstborn) shall not be upon you to destroy you, when I strike fatally with a blow against Eretz Mitzrayim.

¹⁴ And hayom hazeh shall be unto you for zikaron (remembrance, remembering); and ye shall keep it a Chag (Feast) to Hashem throughout your generations; ye shall keep it a Chag (Feast) by a chukkat olam.

¹⁵ Shivat yamim shall ye eat matzot; but the first day ye shall put away se’or (yeast, leaven) out of your batim (houses); for whosoever eateth chametz from the first day until the seventh day, that nefesh shall be cut off from Yisroel.