EX 12:21 Then Moses called for all the elders of Israel and said to them, “Go
and take for yourselves lambs according to your families, and slay the Passover
lamb.
EX 12:22 “You shall take a bunch of hyssop and dip it in the blood which is in the basin, and apply some of the blood that is in the basin to the lintel and the two doorposts; and none of you shall go outside the door of his house until morning.
Notice that the availability of the blood of the Passover Lamb does no one any good if one does not apply it on one’s lintel and doorposts.
He must take a bunch of hyssop, dip it in the blood of the lamb and apply it. Hyssop is a fluffy little plant that was used to apply or sprinkle the blood of the sacrifice.
Hyssop represents faith. We apply and avail ourselves of the benefits of the atonement of Christ by putting our trust in Him and what He did on the cross.
An available and yet untrusted Savior saves no one. He only saves those who put their trust in Him.
He died for your sins and rose again from the dead. Trust Him now for your salvation.