"Makhrafah Al-'Abdi and I brought linens from Hajar. The Prophet ﷺ came to us in bargain with us with some pants. There was someone with me who weighed (the goods) to determine the value. So the the Prophet ﷺ said to the one weighing: 'Weigh and add more.'" [He said:] There are narrations on this topic from Jabir and Abu Hurairah.  

جَلَبْتُ أَنَا وَمَخْرَفَةُ الْعَبْدِيُّ بَزًّا مِنْ هَجَرَ فَجَاءَنَا النَّبِيُّ ﷺ فَسَاوَمَنَا بِسَرَاوِيلَ وَعِنْدِي وَزَّانٌ يَزِنُ بِالأَجْرِ فَقَالَ النَّبِيُّ ﷺ لِلْوَزَّانِ زِنْ وَأَرْجِحْ قَالَ وَفِي الْبَابِ عَنْ جَابِرٍ وَأَبِي هُرَيْرَةَ