وَعَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ رضى الله عنه
قَالَ: «أَمَرَنِي رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَنْ أَبِيعَ غُلَامَيْنِ أَخَوَيْنِ، فَبِعْتُهُمَا، فَفَرَّقْتُ بَيْنَهُمَا، فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: أَدْرِكْهُمَا، فَارْتَجِعْهُمَا، وَلَا تَبِعْهُمَا إِلَّا جَمِيعًا»
The Messenger of Allah (sallallahu alayhi wa sallam) commanded me to sell two youths who were brothers. I sold them and separated them (by selling them to different people). When I made mention of that to the Prophet (sallallahu alayhi wa sallam), he said, “Find them and get them back, and do not sell them except that they are together.”.
Bulugh al-Maram 926, Book 7, Business Transactions, Hadith 37. 1 min read