Musnad Abu Ya'la al-Mawsili 116:59

Ahmad narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us from Qatadah. Abu Dawud said: And Hisham narrated to us from Qatadah, from Anas, that the Messenger of Allah (ﷺ) said—Hisham said: "They shall be brought out of the Fire." Shu'bah said: "Bring out of the Fire whoever said 'There is no god but Allah' and had in his heart of goodness what weighs a grain of wheat. Bring out of the Fire whoever said 'There is no god but Allah' and had in his heart of goodness what weighs a speck of dust." And Shu'bah said: "A speck of dust. And there shall be brought out of the Fire whoever said 'There is no god but Allah' and had in his heart of goodness what weighs a barleycorn."