"...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)

"In this verse [5:51] Allaah tells us that whoever takes the Jews and Christians as friends is one of them because of his taking them as friends. Elsewhere Allaah states that taking them as friends incurs the wrath of Allaah and His eternal punishment, and that if the one who takes them as friends was a true believer he would not have taken them as friends." - Shaykh al-Shanqeeti