במדבר, פרק ל״א, פסוק כ׳

Returning from the battlefield brings not only the physical spoils of war but also deep spiritual and legal challenges. Contact with death creates impurity, requiring a careful purification process for the various materials and tools brought back to the camp. Because these items came into contact with the dead, they must be cleansed [חזקוני, אבן עזרא, ביאור שטיינזלץ]. This profound sensitivity to death and the need for purity stems from human spiritual greatness. People are required to rise above their basic physical nature and strive to be like their Creator [הכתב והקבלה].

The purification process is carried out by sprinkling special water on the third and seventh days [רלב״ג]. The command given to the soldiers is not merely to cleanse themselves, but specifically to purify the captured items for their own use [אבן עזרא, אבי עזר, רש״ר הירש]. This instruction carries important legal weight, signaling that the spoils now rightfully belong to the warriors. It was Eleazar the Priest who taught these laws to the returning men. Moses had become angry, and as a result, the laws regarding the purification of items were hidden from him. Eleazar stepped in to emphasize that the property belonged to the soldiers and permitted them to enter the camp. This reassurance was vital to prevent any frustration that might discourage them from going out to future wars [שפתי כהן].

Specific rules govern exactly which materials can contract impurity. For garments and leather goods, the laws mirror those of other impurities, meaning these items only become impure when they are fully processed, spun, and woven [תורה תמימה, מלבי״ם]. There is also a distinct category for items made from goats. Because regular clothing and leather are already accounted for, this refers to tools crafted from the hard parts of an animal, such as the horns, hooves, and bones [רש״י, רלב״ג, רבנו בחיי, מזרחי, שפתי חכמים]. These might include combs, lantern panels, or hollow horns used to store paint [רלב״ג]. While this rule applies to the bones of all mammals, the specific mention of goats teaches a legal exclusion regarding birds: tools made from bird bones do not contract impurity under Biblical law [תורה תמימה, מזרחי].