Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her) said that she came to the Prophet (peace and blessings be upon him) and said: "O Prophet of Allah, I have nothing except what al-Zubayr gives me. Is there any sin on me if I spend from what he gives me?" He (peace and blessings be upon him) said: "Spend as much as you are able, and do not hoard, lest Allah withhold from you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7814