Musannaf Ibn Abi Shayba 13:2129

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Simak, from Suwayd ibn Qays, who said: I and Makhrafah al-‘Abdi brought goods (bazz) from Hajar. The Prophet, may Allah bless him and grant him peace, came to us and said to the weigher: "Weigh and give extra."