Language:
كتاب السلم
35  
Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)
(8)
Chapter: As-Salam in buying a she-camel to be delivered after it has given birth
(8)
باب السَّلَمِ إِلَى أَنْ تُنْتَجَ النَّاقَةُ
Sahih al-Bukhari 2256

Narrated `Abdullah:

The people used to sell camels on the basis of Habal-al-Habala. The Prophet (ﷺ) forbade such sale. Nafi` explained Habal-al-Habala by saying. "The camel is to be delivered to the buyer after the she-camel gives birth."

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، أَخْبَرَنَا جُوَيْرِيَةُ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ كَانُوا يَتَبَايَعُونَ الْجَزُورَ إِلَى حَبَلِ الْحَبَلَةِ، فَنَهَى النَّبِيُّ صلى الله عليه وسلم عَنْهُ‏.‏ فَسَّرَهُ نَافِعٌ أَنْ تُنْتَجَ النَّاقَةُ مَا فِي بَطْنِهَا‏.‏
Reference : Sahih al-Bukhari 2256
In-book reference : Book 35, Hadith 16
USC-MSA web (English) reference : Vol. 3, Book 35, Hadith 457
  (deprecated numbering scheme)