Exodus 12:13

13 The blood will serve you as a sign marking the houses where you are; when I see the blood, I will pass over [Hebrew: pasach] you - when I strike the land of Egypt, the death blow will not strike you.

Exodus 12:13 Meaning and Commentary

Exodus 12:13

And the blood shall be to you for a token upon the houses
where you are
The blood of the passover lamb being sprinkled on the two sideposts and upper doorposts of the houses inhabited by the Israelites, or where they were eating the passover; this should be a sign or token to them of the Lord's making good his promises, to them, and so of their safety, and to the destroying angel not to enter therein, but pass by and save them:

and when I see the blood, I will pass over you;
for which reason this ordinance now instituted was called the passover, because the Lord, on sight of the blood sprinkled, passed over the houses of the Israelites to those of the Egyptians; or "leaped", as Jarchi says, the word signifies, skipped from one Egyptian house to another, passing by that of the Israelites:

and the plague shall not be upon you, to destroy you, when I smite the
land of Egypt,
the pestilence with which the firstborn should be destroyed.

Exodus 12:13 In-Context

11 "'Here is how you are to eat it: with your belt fastened, your shoes on your feet and your staff in your hand; and you are to eat it hurriedly. It is ADONAI's Pesach [Passover].

12 For that night, I will pass through the land of Egypt and kill all the firstborn in the land of Egypt, both men and animals; and I will execute judgment against all the gods of Egypt; I am ADONAI.

13 The blood will serve you as a sign marking the houses where you are; when I see the blood, I will pass over [Hebrew: pasach] you - when I strike the land of Egypt, the death blow will not strike you.

14 "'This will be a day for you to remember and celebrate as a festival to ADONAI; from generation to generation you are to celebrate it by a perpetual regulation.

15 "'For seven days you are to eat matzah - on the first day remove the leaven from your houses. For whoever eats hametz [leavened bread] from the first to the seventh day is to be cut off from Isra'el.