15.ʿUthmān ibn ʿĪsā narrated from one of his companions, from Abū ʿAbdillāh who said,

“Verily Allah, Blessed and Exalted is He, revealed to Mūsā that one of your companions is speaking ill of you so be wary of him. So he said, ‘O Lord, I do not know him; inform me who he is so that I may know him.’ He replied, ‘O Mūsā, I have found fault with him for his slander [and defamation], and you wish Me to [also] be a defamer!’ He said, ‘Then what should I do, O Lord?’ Allah, the Exalted, replied, ‘Divide your companions into groups of ten, then cast lots between them; the arrow will fall on the group of ten which he is part of. Then divide them again and cast lots between them and the arrow will fall on him.’” He (the narrator) said, “When the man saw that lots were being drawn, he stood up and said, ‘O Messenger of Allah, I am the companion [who spoke ill of you]! By Allah, I will never repeat it again.’”