The Messenger of Allah (ﷺ) gave a decision on the basis of an oath and a single witness.
Sunan Abi Dawud Book 25, Hadith 38
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The Prophet (ﷺ) bought a horse from a Bedouin. The Prophet (ﷺ) took him with him to pay him the price of his horse. The Messenger of Allah (ﷺ) walked quickly and the Bedouin walked slowly. The people stopped the Bedouin and began to bargain with him for the horse as and they did not know that the Prophet (ﷺ) had bought it.
The Bedouin called the Messenger of Allah (ﷺ) saying: If you want this horse, (then buy it), otherwise I shall sell it. The Prophet (ﷺ) stopped when he heard the call of the Bedouin, and said: Have I not bought it from you? The Bedouin said: I swear by Allah, I have not sold it to you. The Prophet (ﷺ) said: Yes, I have bought it from you. The Bedouin began to say: Bring a witness. Khuzaymah ibn Thabit then said: I bear witness that you have bought it. The Prophet (ﷺ) turned to Khuzaymah and said: On what (grounds) do you bear witness?
He said: By considering you trustworthy, Messenger of Allah (ﷺ)! The Prophet (ﷺ) made the witness of Khuzaymah equivalent to the witness of two people.
Sunan Abi Dawud Book 25, Hadith 37 Next Hadith → 'Amr said: In the rights (of the people).
Sunan Abi Dawud Book 25, Hadith 39
The Bedouin called the Messenger of Allah (ﷺ) saying: If you want this horse, (then buy it), otherwise I shall sell it. The Prophet (ﷺ) stopped when he heard the call of the Bedouin, and said: Have I not bought it from you? The Bedouin said: I swear by Allah, I have not sold it to you. The Prophet (ﷺ) said: Yes, I have bought it from you. The Bedouin began to say: Bring a witness. Khuzaymah ibn Thabit then said: I bear witness that you have bought it. The Prophet (ﷺ) turned to Khuzaymah and said: On what (grounds) do you bear witness?
He said: By considering you trustworthy, Messenger of Allah (ﷺ)! The Prophet (ﷺ) made the witness of Khuzaymah equivalent to the witness of two people.
Sunan Abi Dawud Book 25, Hadith 37 Next Hadith → 'Amr said: In the rights (of the people).
Sunan Abi Dawud Book 25, Hadith 39