Exodus 12:22-23 NIV

22 Take a bunch of hyssop,1 dip it into the blood in the basin and put some of the blood2 on the top and on both sides of the doorframe. Not one of you shall go out the door of his house until morning.

References for Exodus 12:22

23 When the LORD goes through the land to strike3 down the Egyptians, he will see the blood4 on the top and sides of the doorframe and will pass over5 that doorway, and he will not permit the destroyer6 to enter your houses and strike you down.

References for Exodus 12:23