"Come now, and let us reason together; says the Lord, "Though your sins be as scarlet, they shall be as white as snow, though they are red like crimson, they shall be as wool." Isaiah 1:18

Faith stands by the Fountain of Blood and washes herself (in the Word) knowing that just one drop can wash away the deep stains of sin.

There is a Fountain Filled With Blood
written by William Cowper the English poet and hymn writer

There is a fountain filled with blood
drawn from Immanuel's veins
And sinners plunged beneath that flood
Lose all their guilty stains

The dying thief rejoiced to see
That fountain in his day;
And there may I, though vile as he
Wash all my sins away

Dear dying Lamb, thy precious blood
Shall never lose its power
Till all the ransomed church of God
Are saved, to sin no more

For since by faith I saw the stream
Thy flowing wounds supply
Redeeming love has been my theme
And shall be till I die

When this poor lisping, stammering tongue
Lies silent in the grave,
Then in a nobler, sweeter song
I'll sing thy power to save.