‏الأيمان : Hadeeth No:4054 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: He who took an oath and (later on) found another thing better than that, he should do that which is better, and expiate for the vow (broken by him)....

‏الصلاة : Hadeeth No:1789 Ubayy b. Ka'b reported that the Prophet of Allaah (sallAllaahu alayhi wa sallam) was near the tank of Banu Ghifar that Gabriel came to him and said: Allaah has commanded you to recite to your people the Qur'an in one dialect. Upon this he said: I ask from Allaah pardon and forgiveness. My people are...