Sayyidah Asma' (may Allah be pleased with her) said: I came to the Messenger of Allah (peace and blessings be upon him) and said: O Prophet of Allah! I have nothing except what al-Zubayr brings to me; would there be any sin on me if I give a little (in charity) out of what he brings me? He (peace and blessings be upon him) said: "Give what you can, and do not hoard, lest Allah withhold from you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحجر / 11327