Anas ibn Malik reported that the Prophet, may Allah bless him andgrant him peace, said, "If the Final Hour comes while you have a palm-cuttingin your hands and it is possible to plant it before the Hour comes, youshould plant it." (ID)
English reference (ID): Book 27, Hadith 479 (ID)
Arabic reference (ID): Book 1, Hadith 479 (ID)