Exodus 12:21-23

Verse 21

Kill the passover - That is, the lamb, which was called the paschal or passover lamb. The animal that was to be sacrificed on this occasion got the name of the institution itself: thus the word covenant is often put for the sacrifice offered in making the covenant; so the rock was Christ, 1Cor 10:4; bread and wine the body and blood of Christ, Mar 14:22, Mar 14:24. St. Paul copies the expression, 1Cor 5:7 : Christ our passover (that is, our paschal lamb) is sacrificed for us.
Verse 22

A bunch of hyssop - The original word אזוב ezob has been variously translated musk, rosemary, polypody of the wall, mint, origanum, marjoram, and Hyssop: the latter seems to be the most proper. Parkhurst says it is named from its detersive and cleansing qualities, whence it was used in sprinkling the blood of the paschal lamb, in cleansing the leprosy, Lev 14:4, Lev 14:6, Lev 14:51, Lev 14:52; in composing the water of purification, Num 19:6, and sprinkling it, Num 19:18. It was a type of the purifying virtue of the bitter sufferings of Christ. And it is plain, from Psa 51:7, that the psalmist understood its meaning. Among botanists hyssop is described as "a genus of the gymnospermia (naked-seeded) order, belonging to the didynamia class of plants. It has under-shrubby, low, bushy stalks, growing a foot and a half high, small, spear-shaped, close-sitting, opposite leaves, with several smaller ones rising from the same joint; and all the stalks and branches terminated by erect whorled spikes of flowers of different colors, in the varieties of the plant. The leaves have an aromatic smell, and a warm pungent taste. The leaves of this plant are particularly recommended in humoral asthmas, and other disorders of the breast and lungs, and greatly promote expectoration." Its medicinal qualities were probably the reason why this plant was so particularly recommended in the Scriptures.
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