Musnad Abu Ya'la al-Mawsili 5:10

Zuhayr narrated to us, Waki' narrated to us, Hisham ibn 'Urwah narrated to us, from his father, from his grandfather, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "For one of you to take his ropes, then come to the mountain, then bring a bundle of firewood upon his back, then sell it, and by its price become self-sufficient, is better for him than to ask people, whether they give him or refuse him."