´It was narrated that Jabir bin' Abdullah said:` "The Messenger of Allah (ﷺ) bought a load of fodder from a Bedouin man. When the transaction was concluded, the Messenger of Allah (ﷺ) said: 'Choose (either to go ahead or to cancel the transaction).' The Bedouin said: 'May Allah grant you a long life of good transaction!"'
Hadith Referenceسنن ابن ماجه / كتاب التجارات / 2184
´It was narrated from Dawud bin Salih Al Madani that his father said:` I heard Abu Sa'eed Al-Khudri say: "The Messenger of Allah (ﷺ) said: 'Transactions may only be done by mutual consent."'
Hadith Referenceسنن ابن ماجه / كتاب التجارات / 2185