وَعَنِ أَبِي سَعِيدٍ اَلْخُدْرِيِّ رضى الله عنه
«أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنْ شِرَاءِ مَا فِي بُطُونِ اَلْأَنْعَامِ حَتَّى تَضَعَ، وَعَنْ بَيْعِ مَا فِي ضُرُوعِهَا، وَعَنْ شِرَاءِ اَلْعَبْدِ وَهُوَ آبِقٌ، وَعَنْ شِرَاءِ اَلْمَغَانِمِ حَتَّى تُقْسَمَ، وَعَنْ شِرَاءِ اَلصَّدَقَاتِ حَتَّى تُقْبَضَ، وَعَنْ ضَرْبَةِ اَلْغَائِصِ»
The Prophet (sallallahu alayhi wa sallam) forbade buying what is in the wombs of domestic animals till they give birth; selling what is in their udders; buying a runaway slave; buying (something from) the spoils of war until they are divided; buying Sadaqat before they are received; and the unknown catch (find) of a diver.
Bulugh al-Maram 940, Book 7, Business Transactions, Hadith 51. 1 min read