"I heard the Messenger of Allah say: 'If the two parties to a transaction disagree, and neither of them has any proof, then it is as the owner of the goods says, or they may cancel it.'''
Sunan an-Nasa'i Book 44, Hadith 200
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the Prophet bought a horse from a Bedouin and asked him to follow him, so that he could pay him for the horse. The Prophet hastened but the Bedouin was slow. Men started to talk to the Bedouin and make offers for the horse, and they did not realize that the Prophet had bought it, until some of them offered more than the Prophet had bought it for. Then the Bedouin called out to the Prophet and said; "Are you going to buy this horse or shall I sell it?" The Prophet stood up when he heard him calling and said: "Have I not bought it from you?" He said: 'No, by Allah, I have not sold it to you, and the Prophet said "I bought it from you." The people started to gaiter around the Prophet and the Bedouion as they were talking, and the Bedouin started to say: "Bring a witness who will testify that you bought it. " Khuzaimah bin habit said: "I bear witness that you bought it" The Prophet turned to Khunzimah and said: "Why are you bearing witness?" He said: "Because I know that you are truthful, O Messenger of Allah" made the testimony of Khuzaimah equivalent to the testimony of two men. (sahih)
Sunan an-Nasa'i Book 44, Hadith 199 Next Hadith → "We were with Abu 'Ubaidah bin 'Abdullah bin Mas'ud when two men who were involved in a transaction came to him. One of them said: 'I bought it for such and such', and the other said; 'I sold it to him for such and such,' Abu 'Ubaidah said" 'something like this was brought to Ibn Masud, and he said; I was with something like this was brought to him. He told the seller to swear an oath, them he gave the purchaser the choice; If he wished, he could buy it, and if he wished he could cancel (the transaction)''
Sunan an-Nasa'i Book 44, Hadith 201
Sunan an-Nasa'i Book 44, Hadith 199 Next Hadith → "We were with Abu 'Ubaidah bin 'Abdullah bin Mas'ud when two men who were involved in a transaction came to him. One of them said: 'I bought it for such and such', and the other said; 'I sold it to him for such and such,' Abu 'Ubaidah said" 'something like this was brought to Ibn Masud, and he said; I was with something like this was brought to him. He told the seller to swear an oath, them he gave the purchaser the choice; If he wished, he could buy it, and if he wished he could cancel (the transaction)''
Sunan an-Nasa'i Book 44, Hadith 201