‘But if he cannot afford a lamb, then he shall bring two turtledoves or two young pigeons as his guilt offering for his sin to the Lord, one as a sin offering and the other as a burnt offering.

If she cannot afford a lamb then she shall take two turtledoves or young pigeons, one as a burnt offering, the other as a sin offering; the priest shall make atonement for her, and she will be clean.’”

Cedar

As for the live bird, he shall take it together with the cedar wood and the scarlet string and the hyssop, and shall dip them and the live bird in the blood of the bird sacrificed over the running water.

The priest shall take cedar wood and hyssop and scarlet [material] and cast them into the midst of the burning heifer.

Hyssop

You shall take a bunch of hyssop, dip it in the blood which is in the basin, and touch some of the blood to the lintel [above the doorway] and to the two doorposts; and none of you shall go outside the door of his house until morning.

A clean person shall take hyssop and dip it in the water and sprinkle it on the tent and on all the furnishings and on the people who were there, and on the one who touched the bone or the one who was killed or the one who died [naturally] or the grave.

Purify me with hyssop, and I will be clean;
Wash me, and I will be whiter than snow.

General references

To cleanse the house then, he shall take two birds and cedar wood and scarlet string and hyssop;

The priest shall take cedar wood and hyssop and scarlet [material] and cast them into the midst of the burning heifer.