Musnad Ahmad 1167:1

Sufyan ibn 'Uyaynah narrated to us, from Ayyub, from Ibn Abi Mulaykah, from Asma, who said: I said to the Prophet, peace and blessings of Allah be upon him: "I have nothing except what Al-Zubayr brings into my house." He said: "Spend, and do not withhold, lest it be withheld from you."