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, says Jehovah; though your sins are as scarlet, they shall be as white as snow; though they are red like crimson, they shall be like 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 with one another, and the blood of Jesus Christ His Son cleanses us from all sin.

Exodus 12:22

And you shall take a bunch of hyssop and dip in the blood in the bowl, and strike the lintel and the doorposts with the blood in the bowl. And none of you shall go out of the door of his house until the morning.

Leviticus 14:4-7

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

Leviticus 14:49-52

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

Numbers 19:18-20

And a clean person shall take hyssop and dip in the water, and sprinkle upon the tent and upon all the vessels, and upon the persons that were there, and upon him that touched a bone, or one killed, 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 sanctifies to the purifying of the flesh,

Revelation 1:5

even from Jesus Christ the faithful Witness, the First-born from the dead and the Ruler of the kings of the earth. To Him who 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 who are arrayed in white robes, and from where do they come?

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 the priest shall command to take two clean live birds for him that is to be cleansed, and cedar wood, and scarlet, and hyssop.
Numbers 19:18
And a clean person shall take hyssop and dip in the water, and sprinkle upon the tent and upon all the vessels, and upon the persons that were there, and upon him that touched a bone, or one killed, 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 sanctifies 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 with one another, and the blood of Jesus Christ His Son cleanses us from all sin.
Revelation 1:5
even from Jesus Christ the faithful Witness, the First-born from the dead and the Ruler of the kings of the earth. To Him who loved us and washed us from our sins in His own blood,

Whiter

Isaiah 1:18
Come now, and let us reason together, says Jehovah; though your sins are as scarlet, they shall be as white as snow; though they are red like crimson, they shall be like 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 who are arrayed in white robes, and from where do they come?

General references

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