Musannaf Ibn Abi Shayba 17:1291

Hafs narrated to us, from al-A'mash, from Abu Ishaq, from 'Amr ibn Maymun, who said: When Allah raised Musa as a confidant, he saw a man clinging to the Throne. He said, "O Lord, who is this?" He said, "A righteous servant from among My servants. If you wish, I will inform you of his deed." He said, "O Lord, inform me." He said, "He used not to envy people for what He had given them of His bounty."