He who bought foodgrain should not sell it until he had measured it. In the narration of Abu Bakr there the word is Ibta' instead of Ishtara.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنِ اشْتَرَى طَعَامًا فَلاَ يَبِعْهُ حَتَّى يَكْتَالَهُ وَفِي رِوَايَةِ أَبِي بَكْرٍ مَنِ ابْتَاعَ