Sunan Ibn Majah 2191
سنن ابن ماجه#2191Da'ifIt was narrated from Samurah that the Messenger of Allah (ﷺ), said:"If two (separate) authorized persons make a sale (of the same thing), then the first transaction is the one that is valid
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniDaif
Muhammad Fouad Abd al-BaqiDaif
Zubair Ali ZaiHasan
In-book reference: 12:55