Asim bin Kulayb (may Allah have mercy on him) said: I heard Iyad bin Marthad, or Marthad bin Iyad, relating from a man of his people that he asked the Messenger of Allah (peace and blessings be upon him) about a deed that would admit him to Paradise. Then the narrator related a hadith similar to the one mentioned before it.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15085