Leviticus 13:58

And the garment, either warp or woof, or whatsoever thing of skin [it be], which thou shalt wash,.... After it had been shut up seven days, and viewed by the priest again: if the plague be departed from them: upon a review of them:

then it shall be washed the second time, and shall be clean; and so reckoned even thoroughly clean, and used; this denotes the thorough washing and cleansing of sinners by the blood of Jesus, see Psalms 51:2; this washing was by dipping; and so the Targum renders it; and Jarchi observes, that all washings of garments, which are for dipping, they interpret by the same word.