وَعَنْ أَبِي أُمَامَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: نَهْيٌ أَنْ تُبَاعَ السِّهَامُ حَتَّى تُقْسَمَ. رَوَاهُ الدَّارمِيّ
Abu Umama told that the Prophet forbade the sale of portions before they were divided. Tirmidhi transmitted it.