Language:
كتاب السلم
35  
Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)
(5)
Chapter: The guarantor in As-Salam
(5)
باب الْكَفِيلِ فِي السَّلَمِ
Sahih al-Bukhari 2251

Narrated `Aisha:

Allah's Messenger (ﷺ) bought some foodstuff (barley) from a Jew on credit and mortgaged his iron armor to him (the armor stands for a guarantor).

حَدَّثَنَا مُحَمَّدٌ، حَدَّثَنَا يَعْلَى، حَدَّثَنَا الأَعْمَشُ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اشْتَرَى رَسُولُ اللَّهِ صلى الله عليه وسلم طَعَامًا مِنْ يَهُودِيٍّ بِنَسِيئَةٍ، وَرَهَنَهُ دِرْعًا لَهُ مِنْ حَدِيدٍ‏.‏
Reference : Sahih al-Bukhari 2251
In-book reference : Book 35, Hadith 12
USC-MSA web (English) reference : Vol. 3, Book 35, Hadith 453
  (deprecated numbering scheme)