‏البيوع : Hadeeth No:3702 Ibn Umar (Allaah be pleased with them) reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: Whosoever grafts the tree and then sells its roots, its fruit will belong to one who grafts it except when provision is laid down by the buyer....

‏الجهاد والسير‏ : Hadeeth No:4302 This hadith has been narrated on the authority of Ibn Umar through some other Chains of transmitters....