(66) باب مَا جَاءَ فِي الرُّجْحَانِ فِي الْوَزْنِ
Narrated Suwaid bin Qais:
"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.[Abu 'Eisa said:] The Hadith of Suwaid is a Hasan Sahih Hadith. The people of knowledge consider it recommended to add more when weighing.Shu'bah reported this Hadith from Simak, so he said: "From Abu Safwan" and he mentioned the narration.
Reference: Jami` at-Tirmidhi 1305
In-book reference: Book 14, Hadith 108
English translation: Vol. 1, Book 12, Hadith 1305