Exodus 12:13

13 But the blood will be a sign on the houses where you are. When I see the blood, I will pass over you. Nothing terrible will hurt you when I punish the land of Egypt.

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 "This is the way you must eat it: You must be fully dressed as if you were going on a trip. You must have your sandals on and your walking stick in your hand. You must eat it in a hurry; this is the Lord's Passover.

12 "That night I will go through the land of Egypt and kill all the firstborn animals and people in the land of Egypt. I will also punish all the gods of Egypt. I am the Lord.

13 But the blood will be a sign on the houses where you are. When I see the blood, I will pass over you. Nothing terrible will hurt you when I punish the land of Egypt.

14 "You are always to remember this day and celebrate it with a feast to the Lord. Your descendants are to honor the Lord with this feast from now on.

15 For this feast you must eat bread made without yeast for seven days. On the first day, you are to remove all the yeast from your houses. No one should eat any yeast for the full seven days of the feast, or that person will be cut off from Israel.