‏البيوع : Hadeeth No:3914 Abu Qatada al-Ansari (Allaah be pleased with him) reported he heard Allaah's Messenger (sallAllaahu alayhi wa sallam) say: Beware of swearing; it produces a ready sale for a commodity, but blots out the blessing....

‏الجهاد والسير‏ : Hadeeth No:4345 It has been narrated on the authority of Salama (b. al-Akwa') who said: We fought against the Fazara and Abu Bakr was the commander over us. He had been appointed by the Messenger oi Allaah (sallAllaahu alayhi wa sallam). When we were onlv at an hour's distance from the water of the enemy, Abu Bakr ...