'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
'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] (Using translation from Ibn Mājah 2228)
نَهَى رَسُولُ اللهِ ﷺ عَنْ بَيْعِ الطَّعَامِ حَتَّى يَجْرِيَ فِيهِ الصَّاعَانِ صَاعُ الْبَائِعِ وَصَاعُ الْمُشْتَرِي وَرُوِيَ مِنْ وَجْهٍ آخَرَ عَنْ أَبِي هُرَيْرَةَ
[Machine] The Prophet ﷺ prohibited selling food until the measurement has been made with two saa' [a specific unit of measurement], so that there would be a surplus for the seller and a deficit for the buyer.
نَهَى النَّبِيُّ ﷺ عَنْ بَيْعِ الطَّعَامِ حَتَّى يَجْرِيَ فِيهِ الصَّاعَانِ فَيَكُونَ لِلْبَائِعِ الزِّيَادَةُ وَعَلَيْهِ النُّقْصَانُ