As-Salam in buying a she-camel to be delivered after it has given birth

Narrated 'Abdullah:

The people used to sell camels on the basis of Habal-al-Habala. The Prophet forbade such sale. Nafi' explained Habalal-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 ﷺ عَنْهُ. فَسَّرَهُ نَافِعٌ أَنْ تُنْتَجَ النَّاقَةُ مَا فِي بَطْنِهَا.