Leviticus 14:6

As for the living bird, he shall take it, and the cedar wood, and the scarlet, and the hyssop, and shall dip them and the living bird in the blood of the bird that was killed over the running water:

Cross-references

In Leviticus 14:51-53, the same ritual with a living bird is applied to cleansing a house, paralleling the leper's cleansing.

In Leviticus 14:4, the same materials (two birds, cedar, scarlet, hyssop) are commanded, setting up the action in verse 6.

In Hebrews 9:22, the principle that purification requires bloodshed is exemplified by this ritual, grounding the NT doctrine of atonement.

In Exodus 12:22, hyssop applies blood for Passover protection, echoing the use of hyssop in the leper's cleansing ritual.

In Numbers 19:6, the same cedar, hyssop, and scarlet are used in the red heifer ritual, connecting the two purification ceremonies.