Musnad Ahmad 32:1984

Muhammad ibn Ja’far narrated to us, Shu’bah narrated to us, and Hajjaj narrated, he said: Shu’bah narrated to me, Qatadah narrated to me, from Anas, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Bring out of the Fire—and Hajjaj said: Allah, the Mighty and Majestic, says: Bring out of the Fire—whoever said: 'There is no god but Allah,' and whoever has in his heart of goodness what weighs a speck. Bring out of the Fire whoever said: 'There is no god but Allah,' whoever has in his heart of goodness what weighs a barleycorn. Bring out of the Fire whoever said: 'There is no god but Allah,' whoever has in his heart of goodness what weighs a wheat grain."