Musnad Ahmad 1118:6

Abu Abd al-Rahman narrated to us, Haywah and Ibn Lahi'ah narrated to us, they said: Abu Hani' ibn Hani' informed us, from Ali ibn Rabah, from Fadalah ibn Ubayd, he said: A necklace containing gold and beads was brought to the Prophet, may Allah bless him and grant him peace, and it was being sold, and it was from the spoils of war. The Prophet, may Allah bless him and grant him peace, ordered the gold that was in the necklace, so it was removed by itself. Then he said: "Gold for gold, weight for weight."