Musnad Ahmad 7:3

Hafs ibn Ghiyath narrated to us, from Hisham, from his father, from al-Zubayr ibn al-Awwam, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "For a man to carry a rope, then go gather firewood, then come and place it in the market and sell it, and then become self-sufficient through it and spend it upon himself, is better for him than to ask people, whether they give him or refuse him."