Musannaf Ibn Abi Shayba 13:818

Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Abu Ishaq, from Muhammad ibn Zayd, who said: I bought a slave girl from the fifth (share) of the spoils. I found fifteen dinars with her, so I brought them to Abd al-Rahman ibn Khalid ibn al-Walid. He said: "They are yours."