ויקרא, פרק ט״ו, פסוק ח׳

The state of impurity experienced by a man with a discharge is absolute and far-reaching. It is not limited to the medical discharge itself or direct physical contact with his body, but extends to his natural bodily fluids. Commentators agree that these fluids act as primary sources of impurity, carrying such a strong level of contamination that anyone affected by them must wash their clothes. The primary approach among commentators is that this category is broad, encompassing not just saliva, but also chest phlegm, nasal mucus, and urine [מלבי״ם, אבן עזרא, ביאור יש״ר, אבי עזר]. The shared characteristic of all these fluids is that they pool inside the body, form drops, and can be physically held back before being released [רש ר הירש, רד צ הופמן, בכור שור]. Furthermore, these fluids only transfer impurity while they are still wet, retaining the state they were in when they left the body, and they lose this property once they dry [תורה תמימה].

There are different perspectives on why these specific fluids carry such severe impurity. One approach points out that the underlying illness is contagious, making the person's saliva physically harmful. This transfer of impurity usually occurs unintentionally, such as when a drop of saliva flies through the air and lands on someone by accident [אבן עזרא]. Another perspective suggests that the impurity stems from the fundamental nature of the fluids themselves, which are raw, unprocessed bodily secretions [רלב״ג].

For the impurity to transfer, the fluid must physically interact with the pure individual. Unlike other biblical rituals—such as the widow's shoe-removal ceremony, where spitting serves merely as a symbolic disgrace and requires no physical contact—here, actual touch is required [מזרחי, תורה תמימה, מלבי״ם, גור אריה]. However, this interaction is not limited to bare skin. The impurity is also transferred through the act of carrying. If the fluid falls onto an object a pure person is holding, such as a walking stick, or onto their clothing, they become impure simply by bearing its weight and moving it through space [מזרחי, שפתי חכמים, מלבי״ם, העמק דבר, ברטנורא]. Consequently, these bodily fluids transfer impurity through two parallel avenues: direct physical contact and the act of carrying.