"...If the party liable is mentally deficient, or weak, or unable Himself to dictate, Let his guardian dictate faithfully, and get two witnesses, out of your own men, and if there are not two men, then a man and two women, such as ye choose, for witnesses, so that if one of them errs, the other can remind her. The witnesses should not refuse when they are called on (For evidence)." - Quran 2:282 (read more)

"O Allah's Apostle! We asked you for mounts, but you took an oath that you would not give us any mounts; we think that you have forgotten your oath.' He said, 'It is Allah Who has given you mounts. By Allah, and Allah willing, if I take an oath and later find something else better than that. then I do what is better and expiate my oath.'" - Sahih Bukhari 7:67:427 (read more)

"It is also incumbent upon Muslims that they should not accept from them [Jews] victuals with which they had come into contact, such as distillates, which cannot be purified. If something can be purified, such as clothes, if they are dry, they can be accepted, they are clean...It would also be better if the ruler of the Muslims would establish that all infidels could not move out of their homes on days when it rains or snows because they would make Muslims impure." - Muhammad Baqir Majlesi