‏الصيام : Hadeeth No:2378 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Whenever you sight the new moon (of the month of Ramadan) observe fast. and when you sight it (the new moon of Shawwal) break it, and if the sky is cloudy for you, then observe fast for thirty days....

‏الحج : Hadeeth No:3118 Anas b. Malik (Allaah be pleased with him) reported: I and Abu Talha (both) came back along with Allaah's Prophet (sallAllaahu alayhi wa sallam). Safiyyah (the wife of the Prophet) rode behind him on his camel and as we came to the out- skirts of Medina he said: (We are those) who return, who repent...