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Narrated Ibn 'Umar:

The Prophet ﷺ said, "No deal is settled and finalized unless the buyer and the seller separate, except if the deal is optional (whereby the validity of the bargain depends on the stipulations agreed upon)."
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏
"‏ كُلُّ بَيِّعَيْنِ لاَ بَيْعَ بَيْنَهُمَا حَتَّى يَتَفَرَّقَا، إِلاَّ بَيْعَ الْخِيَارِ ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 2113
• Sahih al-Bukhari, Vol. 3, Book of Sales and Trade, Hadith 326
• Sahih al-Bukhari, Book of Sales and Trade, Hadith 326