Musnad Ahmad 241:1

Abu al-Nadr narrated to us, he said: al-Murajja ibn Raja’ al-Yashkuri narrated to us, he said: Salam ibn Abd al-Rahman narrated to me, he said: I heard Sawadah ibn al-Rabi’ say: I came to the Prophet, peace and blessings of Allah be upon him, and I asked him, so he ordered for me a herd of camels. Then he said to me: "When you return to your house, command them to improve the fodder of their young camels, and command them to trim their nails, so that they do not injure the udders of their livestock when they milk."