This was afterwards restrained to the priests, but at this time it was allowed to the masters of families, as their present circumstances required. They shall strike it; with a bunch of hyssop, Exodus 12:22, as a badge of distinction between their houses and the Egyptians; not to direct the destroying angel where they were, who could as well discern the houses as the blood in the night, but to direct their thoughts to Christ, whose blood was hereby evidently typified, by whose merits and mediation they obtained this preservation and deliverance from Egypt, as well as their great deliverance from hell.
Related Commentaries of Exodus 12:7
Exodus 12:7
7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it.