"Makhrafah Al' Abdi and I brought linens from Hajar[1] The Messenger of Allah ﷺ came to us to bargain with us with some trousers. There was someone with me who weighed (the goods) in exchange for a wage. So the Prophet ﷺ said to the one weighing: 'Weigh and add more.'"  

جَلَبْتُ أَنَا وَمَخْرَفَةُ الْعَبْدِيُّ بَزًّا مِنْ هَجَرَ فَجَاءَنَا رَسُولُ اللَّهِ ﷺ فَسَاوَمَنَا سَرَاوِيلَ وَعِنْدَنَا وَزَّانٌ يَزِنُ بِالأَجْرِ فَقَالَ لَهُ النَّبِيُّ ﷺ يَا وَزَّانُ زِنْ وَأَرْجِحْ  

"I heard Malik Abu Safwan bin 'Umairah, say: 'I bought a pair of trousers from the Messenger of Allah ﷺ before the Hijrah, and he weighed it for me and allowed more."'  

بِعْتُ مِنْ رَسُولِ اللَّهِ ﷺ رِجْلَ سَرَاوِيلَ قَبْلَ الْهِجْرَةِ فَوَزَنَ لِي فَأَرْجَحَ لِي  

"When you weigh, allow more. "  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا وَزَنْتُمْ فَأَرْجِحُوا