Psalm 51:7

Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.

Isaiah 1:18

Come now, and let us reason together, saith the LORD: though your sins are as scarlet, they shall be white as snow, though they are red like crimson, they shall be as wool.

Hebrews 9:19

For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book and all the people,

1 John 1:7

But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.

Exodus 12:22

And ye shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two side-posts with the blood that is in the basin: and none of you shall go out at the door of his house till the morning.

Leviticus 14:4-7

Then shall the priest command to take for him that is to be cleansed two birds alive, and clean, and cedar-wood, and scarlet, and hyssop.

Leviticus 14:49-52

And he shall take to cleanse the house two birds, and cedar-wood, and scarlet, and hyssop:

Numbers 19:18-20

And a clean person shall take hyssop, and dip it in the water, and sprinkle it upon the tent, and upon all the vessels, and upon the persons that were there, and upon him that touched a bone, or one slain, or one dead, or a grave:

Ephesians 5:26-27

That he might sanctify and cleanse it with the washing of water by the word,

Hebrews 9:13-14

For if the blood of bulls and of goats, and the ashes of a heifer sprinkling the unclean, sanctify to the purifying of the flesh:

Revelation 1:5

And from Jesus Christ, who is the faithful witness, and the first-begotten of the dead, and the prince of the kings of the earth. To him that loved us, and washed us from our sins in his own blood,

Revelation 7:13-14

And one of the elders answered, saying to me, Who are these that are arrayed in white robes? and whence came they?

Treasury of Scripture Knowledge

Summary

Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.

Bible References

Purge

Leviticus 14:4
Then shall the priest command to take for him that is to be cleansed two birds alive, and clean, and cedar-wood, and scarlet, and hyssop.
Numbers 19:18
And a clean person shall take hyssop, and dip it in the water, and sprinkle it upon the tent, and upon all the vessels, and upon the persons that were there, and upon him that touched a bone, or one slain, or one dead, or a grave:
Hebrews 9:19
For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book and all the people,

And

Hebrews 9:13
For if the blood of bulls and of goats, and the ashes of a heifer sprinkling the unclean, sanctify to the purifying of the flesh:
1 John 1:7
But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
Revelation 1:5
And from Jesus Christ, who is the faithful witness, and the first-begotten of the dead, and the prince of the kings of the earth. To him that loved us, and washed us from our sins in his own blood,

Whiter

Isaiah 1:18
Come now, and let us reason together, saith the LORD: though your sins are as scarlet, they shall be white as snow, though they are red like crimson, they shall be as wool.
Ephesians 5:26
That he might sanctify and cleanse it with the washing of water by the word,
Revelation 7:13
And one of the elders answered, saying to me, Who are these that are arrayed in white robes? and whence came they?

General references

Leviticus 15:5
And whoever toucheth his bed, shall wash his clothes, and bathe himself in water, and be unclean until the evening.
Leviticus 16:30
For on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the LORD.
Numbers 19:6
And the priest shall take cedar-wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.