Hebrews 9:19

for when every precept of the law had been represented by Moses to all the people, he took the blood of calves and of goats, with water, wool of a scarlet dye, and hyssop, and sprinkled both the book of the law and all the people,

Treasury of Scripture Knowledge

Summary

And he spake of trees, from the cedar tree that is in Lebanon even unto the hyssop that springeth out of the wall: he spake also of beasts, and of fowl, and of creeping things, and of fishes.

The hyssop

Bible References

The hyssop

Hebrews 9:19
for when every precept of the law had been represented by Moses to all the people, he took the blood of calves and of goats, with water, wool of a scarlet dye, and hyssop, and sprinkled both the book of the law and all the people,