مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٤٦ - PURIFYING THINGS

has become pure or two just persons give intimation about its having become pure, that thing is pure.And similarly when person possesses the impure thing says that it has become pure or when a Muslim has washed the impure thing with water, although it may not be knownwhether or not he has washed it properly. And it is not unlikely that information given about its purity by one just or reliable person may also suffice.
٢٢٩. If a person undertakes to wash and purify the dress of another person and says that he has washed the dress and the other person is satisfied with what he saysthe dress is pure.
٢٣٠. If the state of mind of a Person becomes such that he does not believe that an impure thing has been purified with water he should content himself with hisopinion.

XII. COMING OUT OF BLOOD OF A SLAUGHTERED ANIMAL IN NORMAL QUANTITY:
٢٣١. As stated in Article ٩٨, if an animal is slaughtered in Accordance with the rules prescribed by Islam, and blood comes out of its body in normal quantity, theblood which still remains the body of the animal is pure.
٢٣٢. The above order is peculiar to an animal, whose meat is lawful to eat and does not apply to an animal, whose meat is unlawful. On the other hand on the basisof recommended precaution it does not also apply to the unlawful parts of the body of an animal whose meat is lawful to eat.