ויקרא, פרק י״ג, פסוק נ״ח

The phenomenon of an affliction appearing on clothing is not a natural occurrence, but a miraculous sign of Divine providence serving as a warning from God. This affliction progresses gradually—first appearing on the walls of a house, then on garments, and finally on a person's body—urging repentance before physical harm strikes. This unique warning system operates exclusively within the Land of Israel, which is God's direct inheritance [רבנו בחיי]. When an afflicted garment has been treated and the mark fades, a final purification process begins. This process applies broadly, encompassing even individual threads of warp and woof or leather items. Although these specific materials are not typically susceptible to standard forms of ritual impurity, they are fully sensitive to this miraculous affliction and require complete purification [העמק דבר].

The purification begins with a physical cleaning at the end of the garment's initial quarantine period, performed under a priest's direction [רש״י, ביאור יש״ר]. This is a practical washing using specific detergents to entirely scrub away the stain [רש ר הירש, רד צ הופמן]. For fabric, this involves rubbing the material together, whereas for leather, simply soaking it in water constitutes washing [תורה תמימה]. The goal is the absolute cessation and removal of the mark [שד״ל]. The stain must be completely uprooted without leaving any trace; it is insufficient if the mark merely shifts to another area of the fabric [תורה תמימה, מלבי״ם, אדרת אליהו, אילת השחר]. However, if the spot changes to a color not associated with these afflictions, the mark is considered successfully removed, even if the garment has not entirely regained its original appearance [רלב״ג].

Once the physical mark is gone, a final step is required. The primary approach among commentators is that there is a fundamental difference between the initial cleaning and this subsequent washing. While the first washing removes the physical stain, the second is actually a full immersion in a ritual bath to achieve spiritual purity [רש״י, חזקוני, מלבי״ם, אדרת אליהו, רש ר הירש, הכתב והקבלה, ביאור שטיינזלץ, אבן עזרא]. This distinction is historically reflected in early translations, which describe the first action as whitening or cleaning, and the second as immersion [רש״י, נתינה לגר, מלבי״ם]. Because the garment existed in a state of doubtful impurity during its quarantine, it requires immersion just as a person does after healing from a similar affliction [בכור שור]. Furthermore, this immersion must be performed intentionally; an accidental drop into water does not suffice, just as the initial cleaning was done with clear intent [תורה תמימה].

Using the concept of washing to describe a ritual immersion stems from the physical actions involved. The root word for washing is closely related to the concept of pressing or forcing downward. Just as cleaning a garment requires pressing its fabric together, immersing a garment requires forcefully pressing it down beneath the surface of the water, as fabric naturally tends to float. Therefore, whenever washing is mentioned in the context of purification from impurity, it refers to this complete, forceful submersion in a ritual bath [הכתב והקבלה].