‏الصيام : Hadeeth No:2520 Ibn'Abbas (Allaah be pleased with both of them) reported that the Messenger of Allaah (sallAllaahu alayhi wa sallam) arrived in Medina and found the Jews observing fast on the day of 'Ashura. The Messenger of Allaah (sallAllaahu alayhi wa sallam) said to them: What is the (significance) of this day ...

‏البيوع : Hadeeth No:3622 Ibn Umar (Allaah be pleased with them) reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) forbade the outbidding (against another)....