‏الجهاد والسير‏ : Hadeeth No:4304 Ibn Umar reported that he heard the Messenger of Allaah (sallAllaahu alayhi wa sallam) saying: There will be a flag for every perfidious person on the Day of Judgment....

‏البيوع : Hadeeth No:3648 Ibn 'Umar (Allaah be pleased with them) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying,: He who bought foodgrain should not sell it until he had taken possession of it....