Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) "forbade the sale of the young in the bellies of livestock until they give birth, and (forbade the sale) of what is in their udders unless it is by measure, and forbade buying the spoils of war until they are distributed, and also forbade buying charity (sadaqat) until it is taken into possession, and forbade buying a runaway slave, and also forbade the sale of a diver's dive."
Note: All these things fall under the sale of gharar; although this hadith is not established with a sound chain, it is established from the Prophet (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10848
Hadith Gradingمحدثین:منكر
Hadith Takhrij«منكر۔ اخرجه عبدالرزاق 14375۔ ابن ماجه 2196»