[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