Musannaf Ibn Abi Shayba 33:437

Ghundar narrated to us, from Shu'bah, from Simak, from al-Nu'man ibn Humayd, who said: I entered with my maternal uncle, 'Abbad, upon Salman. When he saw him, Salman shook his hand. He [my uncle] had his hair cut short, and he was weaving palm leaves. He said: "He bought [materials] for me for a dirham, and I weave it, then I sell it for three. I give a dirham in charity, I put a dirham back into it [the trade], and I spend a dirham. And if 'Umar were to forbid me, I would not desist."