ויקרא, פרק י״א, פסוק ל״ו

Water serves as the ultimate source of purity, but its ability to cleanse depends entirely on its state in nature. While water held inside vessels is susceptible to spiritual impurity, water that remains connected to the ground retains its pure state and possesses the unique power to cleanse the impure. The primary approach among commentators is that natural bodies of water are meant to be contrasted with liquids contained in vessels. A distinction exists among the types of natural water sources. A spring represents living water that bubbles up from an underground source and flows outward. Conversely, a pit refers to a man-made excavation or a natural depression where standing water, such as rainwater, pools together. The gathering of these waters must consist exclusively of water, excluding other liquids or blood [אבן עזרא, ביאור יש״ר, מלבי״ם, הירש, הופמן, תורה תמימה].

The purity of these natural water sources carries a dual significance. First, unlike drawn water, water connected to the ground cannot contract impurity at all, even if the carcass of an impure creature falls into it. Second, these waters do not merely maintain their own purity; they actively purify those who immerse in them. If the intention was solely to state that the water remains unaffected by contamination, it would have simply noted that it does not become impure. The declaration of its purity reveals its active power to cleanse [רש״י, מזרחי, גור אריה, דברי דוד, שפתי חכמים, הירש, הופמן]. From these definitions, the foundational laws of ritual baths emerge. Purifying waters must be attached to the ground and cannot be drawn using vessels. Furthermore, the creation of the ritual bath must occur in a state of purity, avoiding any use of containers susceptible to impurity. There is also a practical distinction between the sources: a spring can purify even while flowing and in any quantity, whereas a gathered pool only purifies when the water is stationary and reaches a specific, required volume [תורה תמימה, מלבי״ם, הירש, הופמן, העמק דבר].

A complex situation arises when a person or object is submerged in these pure waters and makes direct contact with a dead creature. Most commentators explain that although the water itself remains pure, the individual touching the contamination inside the water becomes impure. This clarification prevents a logical but incorrect assumption: one might think that if the ritual bath is powerful enough to purify an already impure person, it should certainly be able to protect a pure person from contracting impurity while inside it. However, the water does not act as a protective shield against direct physical contact with contamination [רש״י, מזרחי, שד״ל, גור אריה, מלבי״ם, שטיינזלץ]. On the other hand, some commentators view this scenario as teaching a specific rule regarding impure creatures. In this view, these creatures only transfer impurity through direct physical touch, rather than by merely being carried [רמב״ן, רלב״ג, אדרת אליהו].