‏الصلاة : Hadeeth No:1566 Hafsa reported: When the dawn appeared, the Prophet of Allaah (sallAllaahu alayhi wa sallam) observed two rak'ahs (of Sunnah prayers)....

‏البيوع : Hadeeth No:3907 Ibn 'Abbas (Allaah be pleased with them) reported that when Allaah's Messenger (sallAllaahu alayhi wa sallam) came to (Medina) and the people were paying in advance (for the fruits, etc.), he said to them: He who makes an advance payment should not make advance payment except for a specified measure...