Exodus 12:13

13 The blood on the doorposts will be a sign to mark the houses in which you live. When I see the blood, I will pass over you and will not harm you when I punish the Egyptians.

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 You are to eat it quickly, for you are to be dressed for travel, with your sandals on your feet and your walking stick in your hand. It is the Passover Festival to honor me, the Lord.

12 "On that night I will go through the land of Egypt, killing every first-born male, both human and animal, and punishing all the gods of Egypt. I am the Lord.

13 The blood on the doorposts will be a sign to mark the houses in which you live. When I see the blood, I will pass over you and will not harm you when I punish the Egyptians.

14 You must celebrate this day as a religious festival to remind you of what I, the Lord, have done. Celebrate it for all time to come."

15 The Lord said, "For seven days you must not eat any bread made with yeast - eat only unleavened bread. On the first day you are to get rid of all the yeast in your houses, for if anyone during those seven days eats bread made with yeast, he shall no longer be considered one of my people.