The document divides impurities into three categories: agreed upon impurities which include carrion, blood from slaughtered land animals, and human urine and feces. There is some disagreement over impurities like sperm and vomit. Islamic law pardons some impurities like mud in streets and small amounts of blood. Impurities can be purified through washing, moistening, scrubbing, wiping, rubbing off then washing if the impurity has weight, or washing if wet. Urine of a weaning boy needs moistening. Finished items are cleaned by wiping and bowls licked by dogs require 7 washes, one with dirt.