الكافي 2/1/55/9

9. Abu Ali al-Ash’ari has narrated from Muhammad ibn Ali ibn Mahbub from Ayyub ibn Nuh from ‘Abbas ibn ‘Amir from Rabi’ ibn Muhammad al-Musalli from abu Muhammad from ‘Imran from Sa’id ibn Yasar from Abu ‘Abdillah عليه السلام who has said the following: “When two men dispute each other, two angels come down and say to the foolish one of the two, ‘You said what you said and you were the kind to say what you said and you will be brought to account for what you have said.’ Then they will say to the forbearing one of the two men, ‘You exercised patience and forbearance. Allah will forgive you if you will complete it.’ The Imam said, ‘If the forbearing man answers back to the other man the two angels will ascend.’”