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." (DE)
English reference (DE): Book 27, Hadith 479 (DE)
Arabic reference (DE): Book 1, Hadith 479 (DE)