Sahih Muslim 1531c

Translation

When two persons enter into a transaction, each of them has the right to annul it so long as they are not separated and are together (at the place of transaction) ; or if one gives the other the right (to annul the transaction) But if one gives the other the option, the transaction is made on this condition (i. e. one has the right to annul the transaction), it becomes binding. And if they are separated after they have made the bargain and none of them annulled it, even then the transaction is binding.

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Other narrations of this report

Sahih al-Bukhari 2109Sunan an-Nasa'i 4470Sunan an-Nasa'i 4481al-Sunan al-Kubra (al-Nasa'i) 6033al-Sunan al-Kubra (al-Nasa'i) 6043

Narrators

1. 1
   ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb

   One of the Companions who narrated most often, and one of the ʿAbādilah; he was among the people most strict in following the narrations (athar).d. 72 AH, or 73 AH, or 74 AH, also said: 75 AH
   عَبْدُ اللهِ بْنُ عُمَرَ بْنِ الْخَطَّابِأحد المكثرين من الصحابة والعبادلة ، وكان من أشد الناس اتباعا للأثر
   عن
2. 2
   Nāfiʿ mawlá Ibn ʿUmar

   trustworthy (thiqah), reliable (thabt), a well-known jurist (faqīh)d. 116 AH, or 117 AH, or 118 AH, or 119 AH, or 120 AH
   نَافِعٍثقة ثبت فقيه مشهور
   عن
3. 3
   al-Layth b. Saʿd

   Trustworthy (thiqah), reliable (thabt), a jurist (faqīh), a well-known imamd. 175 AH, or 176 AH, or 177 AH
   اللَّيْثُثقة ثبت ، فقيه إمام مشهور
   حدثنا
4. 4
   Qutaybah b. Saʿīd

   trustworthy, precise (thiqah thabt)d. 240 AH, or: 241 AH
   قُتَيْبَةُ بْنُ سَعِيدٍثقة ثبت
   حدثنا
5. 5
   Muslim

   Trustworthy (thiqah), a retentive memorizer (ḥāfiẓ), an imam, an author of compilations, knowledgeable in jurisprudence (fiqh)d. Muḥammad b. Yaʿqūb said: 261 AH, Makkī b. ʿAbdān said: 259 AH
   مُسْلِمٌثقة حافظ ، إمام ، مصنف ، عالم بالفقه

Who each narrator was and how reliable, from hdith.com

Latin names and English verdicts with a dotted underline are machine translations, not reviewed.