Psalm 51:7

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

Isaiah 1:18

“Come, let us discuss this,”
says the Lord.
“Though your sins are like scarlet,
they will be as white as snow;
though they are as red as crimson,
they will be like wool.

Hebrews 9:19

For when every command had been proclaimed by Moses to all the people according to the law, he took the blood of calves and goats, along with water, scarlet wool, and hyssop, and sprinkled the scroll itself and all the people,

1 John 1:7

But if we walk in the light as He Himself is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.

Exodus 12:22

Take a cluster of hyssop, dip it in the blood that is in the basin, and brush the lintel and the two doorposts with some of the blood in the basin. None of you may go out the door of his house until morning.

Leviticus 14:4-7

the priest will order that two live clean birds, cedar wood, scarlet yarn, and hyssop be brought for the one who is to be cleansed.

Leviticus 14:49-52

He is to take two birds, cedar wood, scarlet yarn, and hyssop to purify the house,

Numbers 19:18-20

A person who is clean is to take hyssop, dip it in the water, and sprinkle the tent, all the furnishings, and the people who were there. He is also to sprinkle the one who touched a bone, a grave, a corpse, or a person who had been killed.

Ephesians 5:26-27

to make her holy, cleansing her with the washing of water by the word.

Hebrews 9:13-14

For if the blood of goats and bulls and the ashes of a young cow, sprinkling those who are defiled, sanctify for the purification of the flesh,

Revelation 1:5

and from Jesus Christ, the faithful witness, the firstborn from the dead and the ruler of the kings of the earth.

To Him who loves us and has set us free from our sins by His blood,

Revelation 7:13-14

Then one of the elders asked me, “Who are these people robed in white, and where did they come from?”

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
the priest will order that two live clean birds, cedar wood, scarlet yarn, and hyssop be brought for the one who is to be cleansed.
Numbers 19:18
A person who is clean is to take hyssop, dip it in the water, and sprinkle the tent, all the furnishings, and the people who were there. He is also to sprinkle the one who touched a bone, a grave, a corpse, or a person who had been killed.
Hebrews 9:19
For when every command had been proclaimed by Moses to all the people according to the law, he took the blood of calves and goats, along with water, scarlet wool, and hyssop, and sprinkled the scroll itself and all the people,

And

Hebrews 9:13
For if the blood of goats and bulls and the ashes of a young cow, sprinkling those who are defiled, sanctify for the purification of the flesh,
1 John 1:7
But if we walk in the light as He Himself is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin.
Revelation 1:5
and from Jesus Christ, the faithful witness, the firstborn from the dead and the ruler of the kings of the earth.

To Him who loves us and has set us free from our sins by His blood,

Whiter

Isaiah 1:18
“Come, let us discuss this,”
says the Lord.
“Though your sins are like scarlet,
they will be as white as snow;
though they are as red as crimson,
they will be like wool.
Ephesians 5:26
to make her holy, cleansing her with the washing of water by the word.
Revelation 7:13
Then one of the elders asked me, “Who are these people robed in white, and where did they come from?”

General references

Leviticus 15:5
Anyone who touches his bed is to wash his clothes and bathe with water, and he will remain unclean until evening.
Leviticus 16:30
Atonement will be made for you on this day to cleanse you, and you will be clean from all your sins before the Lord.
Numbers 19:6
The priest is to take cedar wood, hyssop, and crimson yarn, and throw them onto the fire where the cow is burning.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.