Musannaf Ibn Abi Shayba 13:2953

Abu Bakr narrated to us, he said: Muhammad ibn Ubayd narrated to us, from Ya’qub ibn Qays, that Sa’id ibn Jubayr had a dirham in his hand. I said to him, "Shall I weigh it?" So he gave it to me and said, "If it were defective, I would not have given it to you."