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