Musnad Ahmad 5:21

Abdullah narrated to us, Muhammad ibn Abi Bakr al-Muqaddami narrated to me, Harun ibn Muslim narrated to us, al-Qasim ibn Abd al-Rahman narrated to us, from Muhammad ibn Ali, from his father, from Ali, who said: The Prophet, may Allah bless him and grant him peace, said to me: "O Ali, perform the ablution (wudu) thoroughly, even if it is difficult for you. Do not consume charity (sadaqah). Do not breed donkeys with horses. And do not sit with the astrologers."