وَعَنْهُ: أَنَّ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنِ اِشْتَرَى طَعَاماً فَلَا يَبِعْهُ حَتَّى يَكْتَالَهُ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “If anyone buys a grain he must not sell it till he weighs it.”.
Bulugh al-Maram 910, Book 7, Business Transactions, Hadith 21. 1 min read