Hadith 405
Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings be upon him): "Give glad tidings to this Ummah of help, brilliance, and establishment (i.e., influence in the world). Whoever among them performs an act of the Hereafter for the sake of the world will have no share in the Hereafter."