In looking at this confession, we can see that we have to know what the blood of Jesus does for us. Then, we have to take it from the “blood bank” and get it into our lives. There is a parallel for this application in the Passover ceremony, which was God’s provision of deliverance and salvation for Israel. (See Exodus 12:21–27.) The father of each family had to kill a lamb (the sacrifice) and catch its blood in a basin. This act demonstrates the tremendous responsibility of fathers to be priests of their families.
The blood in the basin, however, did not protect any Israelite family; it had to be transferred from the basin to where the family lived. Only one means was provided, and that was hyssop. This plant is common in the Middle East; it grows everywhere there. So they had to pick a bunch of hyssop, dip it in the blood, and strike it on the lintel and two doorposts of their dwelling, but never on the threshold.
You are never to walk over the blood.
With that done, the destroying angel could not enter the dwelling. But only those Israelites who were in their homes, safe behind the blood, were protected. That was the only place of safety in Egypt that night.