‏البيوع : Hadeeth No:3632 Anas b. Malik (Allaah be pleased with him) reported: We were forbidden that a townsman should sell for a man of the desert, even if he is his brother or father....

‏الصيام : Hadeeth No:2636 Ibn 'Umar (Allaah be pleased with both of them) reported that the Prophet of Allaah (sallAllaahu alayhi wa sallam) used to observe i'tikaf in the last ten days of Ramadan....