Sunan An-Nasa'i

It was narrated from Asma' bint Abi Bakr that she came to the Prophet and said:""O Prophet of Allah, I do not have anything but that which Az-Zubair brings to me. Is there any sin on me if I give a small amount of that which he brings to me?"" He said: Give whatever you can, and do not withhold what you have, lest Allah withhold provision from you