Musnad Abu Ya'la al-Mawsili 160:221

Ubayd Allah ibn Umar al-Qawariri narrated to us, Sufyan and Yahya ibn Sa'id narrated to us, from Muhammad ibn Ajlan, from Sa'id ibn Abi Sa'id al-Maqburi, from Abu Hurayrah, that a man said: "O Messenger of Allah, I have a dinar." He said: "Spend it on yourself." He said: "I have another dinar." He said: "Spend it on your wife." He said: "I have another dinar." He said: "Spend it on your child." He said: "I have another dinar." He said: "Spend it on your servant." He said: "I have another dinar." He said: "You know best."