Once, a dispute arouse between the Commander of the Faithful Ali bin Ali Talib, when he was the Caliph, and a Jewish man who went to Judge Shurayh al-Kindi.  Shuray tells the details of what happened:

“Ali found he was missing his coat of mail, so he went back to Kufa and found it in the hands of a Jewish man who was selling it in the market.  He said, ‘O Jew!  That coat of mail is mine!  I did not give it away or sell it!’

The Jew responded ‘It is mine.  It is in my possession.’

Ali said, ‘We will have the judge rule on this for us.’

So they came to me and Ali sat next to me and said, ‘That coat of mail is mine; I did not give it away or sell it.’

The Jew sat in front of me and said, ‘That is my coat of mail.  It is in my possession.’

I asked, ‘O Commander of the Faithful, do you have any proof?’

‘Yes,’ Ali said. ‘My son Hasan and Qanbarah can testify that it is my coat of mail.’

I said, ‘Commander of the Faithful, the testimony of a son in his father’s favor is not admissible in court.’

Ali exclaimed, ‘How Perfect is God!  You cannot accept the testimony of a man who has been promised Paradise?  I heard the Messenger of God saying that Hasan and Husain are the princes of the youth in Paradise.

The Jewish man said, ‘The Commander of the Faithful takes me before his own judge and the judge rules in my favor against him!  I bear witness that no one deserves worship except God and that Muhammad is His Messenger [the Jewish man accepted Islam], and that the coat of armor is yours, Commander of the Faithful.  You dropped it at night and I found it. (Hayyan, Abu Bakr, ‘Tarikh al-Qudat,’ vol 2, p. 200)