And the priest shall take cedar wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.
Leviticus 14:4
the priest shall command them to take for him who is to be cleansed two living clean birds and cedarwood and scarlet stuff and hyssop;
Leviticus 14:6
He shall take the living bird with the cedarwood and the scarlet stuff and the hyssop, and dip them and the living bird in the blood of the bird that was killed over the running water;
Leviticus 14:49
And for the cleansing of the house he shall take two small birds, with cedarwood and scarlet stuff and hyssop,
Psalm 51:7
Behold, thou desirest truth in the inward being; therefore teach me wisdom in my secret heart.
Isaiah 1:18
"Come now, let us reason together, says the LORD: though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall become like wool.
Hebrews 9:19-23
19
For when every commandment of the law had been declared by Moses to all the people, he took the blood of calves and goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,
20
saying, "This is the blood of the covenant which God commanded you."
21
And in the same way he sprinkled with the blood both the tent and all the vessels used in worship.
22
Indeed, under the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness of sins.
23
Thus it was necessary for the copies of the heavenly things to be purified with these rites, but the heavenly things themselves with better sacrifices than these.