The tradition mentioned above has also been transmitted by Ibn Umar from the Prophet ﷺ to the same effect through a different chain of narrators. This version adds: "Or one of them tells the other: "Exercise the right. "
Hadith Referenceسنن ابي داود / كتاب الإجارة / 3455
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (2109) صحيح مسلم (1531)
Benefits and Issues: Benefit: If, during a transaction, the shopkeeper or the buyer says, "Look at it now, make your choice," and the other party accepts it, then the transaction will be concluded. And the right to revoke (the sale) will no longer remain. No matter how long their sitting (session) may continue.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 3455