The following is excerpted from Tarikh al-Khulafa’ by the well known scholar Jalal al-Din al-Suyuti (born 849 H/1445 CE):

When [the fourth Caliph] ‘Ali was setting out to Siffin, he found that he was missing a coat of armour of his. When the war was over and he returned to Kufa, he came across the armour in the hands of a Jewish man. He said to the Jew, ‘The armour is mine; I have not sold it or given it away.’ The Jew said, ‘It is my armour and it is in my hand.’ He replied, ‘Let us go to the qadi [judge]!’ ‘Ali went first…Qadi Shurayh said, ‘Speak, O Amir al-Mu’minin [Commander of the Faithful].’ He said, ‘Yes. This armour, which this Jew has, is my armour; I did not sell it and I did not give it away.’ Shurayh said, ‘What do you say, O Jew?’ He said, ‘It is my armour and it is in my possession.’ Shurayh said, ‘Do you have any evidence, O Amir al-Mu’minin?’ He said, ‘Yes. Qanbar and al-Hasan will witness that the armour is mine.’ Shurayh said [ruling against him], ‘A son’s witness is not acceptable on behalf of his father.’ ‘Ali said, ‘A man from the Garden, and his testimony is not acceptable? I heard the Prophet, may Allah bless him and grant him peace, saying, “Al-Hasan and al-Hussain are the two lords of the youth of the people of the Garden.”’

The Jew said, ‘The Amir al-Mu’minin brought me before his qadi, and his qadi gave judgement against him. I witness that this is the Truth, and I witness that there is no god but Allah and I witness that Muhammad is the messenger of Allah, and that the armour is your armour.’

[Tarikh al-Khulafa’ (‘History of the Caliphs’), Jalal al-Din al-Suyuti, cf. partial English translation by Abdassamad Clarke, Ta-Ha Publishers, London, 1995, pp. 204-205]