"Whoever buys food, let him not sell it until he has taken full possession of it."  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنِ ابْتَاعَ طَعَامًا فَلاَ يَبِعْهُ حَتَّى يَسْتَوْفِيَهُ  

"The Messenger of Allah ﷺ said: 'Whoever buys food, let him not sell it until he has taken full possession of it.'" (Sahih) In his narration, (one of the narrators) Abu 'Awanah said: "Ibn 'Abbas said: 'I think everything is like food."'  

قَالَ رَسُولُ اللَّهِ ﷺ مَنِ ابْتَاعَ طَعَامًا فَلاَ يَبِعْهُ حَتَّى يَسْتَوْفِيَهُ قَالَ أَبُو عَوَانَةَ فِي حَدِيثِهِ قَالَ ابْنُ عَبَّاسٍ وَأَحْسِبُ كُلَّ شَىْءٍ مِثْلَ الطَّعَامِ  

'The Messenger of Allah ﷺ forbade selling food bought by measure until two Sa' have been measured - the Sa' of the seller and the Sa' of the buyer."[1]  

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ بَيْعِ الطَّعَامِ حَتَّى يَجْرِيَ فِيهِ الصَّاعَانِ صَاعُ الْبَائِعِ وَصَاعُ الْمُشْتَرِي