Sahih Muslim

If the people were given according to their claims, they would claim the lives of persons and their properties, but the oath must be taken by the defendant.

Ibn 'Abbas reported that Allah's Messenger (ﷺ) pronounced judgment on the basis of oath by the defendant.

Ibn 'Abbas reported that Allah's Messenger (ﷺ) pronounced judgment on the basis of an oath and a witness (by the plaintiff).

You bring to me, for (judgment) your disputes, some of you perhaps being more eloquent in their plea than others, so I give judgment on their behalf according to what I hear from them. (Bear in mind, in my judgment) if I slice off anything for him from the right of his brother, he should not accept that, for I sliced off for him a portion from the Hell.

This hadith has been narrated on the authority of Hisham with the same chain of transmitters.

I am a human being and the claimants bring to me (the dispute) and perhaps some of them are more eloquent than the others. I judge him to be on the right, and thus decide in his favcur. So he whom I, by my judgment, (give the undue share) out of the right of a Muslim,. I give him a portion of Fire; he may burden himself with it or abandon it.

This hadith has been transmitted on the authority of Ma'mar with a slight variation of words.