And if he is not able to bring a lamb, then he shall bring for the guilt of his sin two turtledoves or two young pigeons unto the LORD, one for his sin and the other for a burnt offering.

And if she is not able to bring a lamb, then she shall bring two turtledoves or two young pigeons: the one for the burnt offering and the other as sin; and the priest shall reconcile her, and she shall be clean.

Cedar

then he shall take the living bird 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 living water;

Then the priest shall take cedar wood and hyssop and scarlet and cast it into the midst of the burning of the heifer.

Hyssop

And ye shall take a bunch of hyssop and dip it in the blood that is in the basin and touch the lintel and the two side posts with the blood that is in the basin; and none of you shall go out of the door of his house until the morning.

and a clean person shall take hyssop and dip it in the water and sprinkle it upon the tent and upon all the stuff and upon the persons that were there and upon the one that touched the bone or the one slain or the one dead or the grave.

Remove the sin in me with hyssop, and I shall be clean; wash me, and I shall be whiter than snow.

General references

Then to remove the sin from the house he shall take two birds and cedar wood and scarlet and hyssop,

Then the priest shall take cedar wood and hyssop and scarlet and cast it into the midst of the burning of the heifer.