Musnad Ahmad 30:3829

Kathir narrated to us, Ja'far narrated to us, Yazid ibn al-Asamm narrated to us, from Abu Hurairah: That the Prophet, peace and blessings of Allah be upon him, said: "Indeed, Allah, the Almighty and Majestic, does not look at your forms and your wealth, but He only looks at your hearts and your deeds."