Shaabi says: that Imam Ali saw his stolen armor in the hands of a Christian man. He brought him before the judge and sat beside the Christian man

Then he said: This is my armor. The Christian man said this is my armor, but Amir al-Mu’minin does not lie either

  ? The judge said to Imam Ali: Do you have any witnesses

 !Imam Ali laughed and said: No

The Christian man took the armor and left; When he went away, he came back and said: I testify that such trials are exclusive to the Prophets.

Amir al-Mu’minin (peace be upon him) went to the judge he appointed, and the judge condemned him. After that, a Christian man converted to Islam and admitted that armor had fallen from his hand when Imam Ali’s army marched to Safin

Imam Ali was pleased with his conversion to Islam and gave him armor and a horse

Translation of al-Kamal, Ibn Athir, vol. 10, p. 238