And you shall take a bunch of hyssop, and dip it in the blood that is in the earthen vessel, and upon the upper bar without and upon the two posts you shall sprinkle of the blood which is in the earthen vessel, and not a man of you must come forth from the door of his hour till the morning.
Why Hyssop and Not Cedar Marked the Doors of Israel
Targum Pseudo-Jonathan on Exodus 12:22