Ata' bin Yasar (may Allah have mercy on him) narrates from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that he said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever bears witness that there is no god worthy of worship except Allah and that Muhammad is the Messenger of Allah, establishes the prayer, pays the zakah, and fasts Ramadan, it is a right upon Allah that He forgive him." Then the narrator mentioned a hadith like the narration of Hisham bin Sa'd.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17466