Mukhtasar Muslim

Narrated from Sayyida Asma bint Abi Bakr Siddiq (may Allah be pleased with her) that she came to the Noble Prophet (peace and blessings be upon him) and said, "O Messenger of Allah (peace and blessings be upon him), I have nothing except what Zubair (may Allah be pleased with him) gives me. If I give some of it in charity, will I be sinful?" He (peace and blessings be upon him) said, "Give as much as you can, do not hoard it, and do not keep reminding (of your charity), otherwise Allah will also withhold from you."