Sahih Bukhari Volume 007, Book 064, Hadith Number 277.

Narrated By 'Aisha : Hind bint 'Utba said, "O Allah's Apostle! Abu Sufyan is a miser and he does not give me what is sufficient for me and my children. Can I take of his property without his knowledge?" The Prophet said, "Take what is sufficient for you and your children, and the amount should be just and reasonable.