Musnad Ahmad 760:4

'Attab ibn Ziyad narrated to us, Abdullah ibn al-Mubarak narrated to us, Khalid ibn Sa'id informed us, from Qays ibn Abi Hazim, from al-Sunabihi, who said: The Messenger of Allah (peace and blessings of Allah be upon him) saw an aged she-camel among the camels of the charity (zakat). He became angry and said: "What is this?" He (the man) said: "O Messenger of Allah, I exchanged it for two young camels from the outskirts of the charity." Then he (the Prophet) remained silent.