Musannaf Ibn Abi Shayba 13:483

Abu Bakr narrated to us, he said: Abd al-Rahim ibn Sulayman narrated to us, from Mujalid, from Qays, from al-Sanabihi al-Ahmasi, who said: The Prophet, may Allah bless him and grant him peace, saw an aged she-camel and said: "What is this she-camel?" He said: "O Messenger of Allah, I traded for it with two young camels from the inferior camels." He said: "Then it is good, then."