Ruling 221

If a person is certain or confident that an impure object has become pure, or two dutiful (ʿādil) people testify to it having become pure and their testimony concerns the reason for it having become pure, then the object is pure; for example, they testify that an item of clothing that had become impure with urine has been washed twice. The same applies if a person who is in possession of an impure object says that it has become pure, and he is not suspected to be someone whose word in this case cannot be accepted in this case; or, if a Muslim washes an impure object with the intention of making it pure, even if it is not known whether he has washed it properly or not.