Musannaf Ibn Abi Shayba 33:1317

Muhadir narrated to us, he said: Al-A'mash narrated to us, from Ibrahim al-Taymi, who said: I have indeed reached sixty of the companions of Abdullah in this mosque of ours, the youngest of whom was al-Harith ibn Suwayd. And I heard him reciting: "When the earth is shaken," until he reached: "So whoever does an atom's weight of good will see it," and he wept. Then he said: "Indeed, this reckoning is severe."