Sunan an-Nasa'i 4469
سنن النسائي#4469SahihIt was a narrated from Ayyub, from Nafi from Ibn 'Umar that the Messenger of Allah said:"The Messenger of Allah said: "The two parties to a transaction both have the choice who long as they have not separated or one of them says to the other: 'Decide!"' (Sahih)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 44:21