‘A’isha told that Hind daughter of ‘Utba said, “Messenger of God, Abu Sufyan is a niggardly man who does not give me and my son enough; except what I take from him without his knowledge.” He replied, “Take what is enough for you and your son to the extent recognised by the law.”*
* Bil ma’roof.This is what is generally recognised as reasonable. The amount would vary according to the circumstances of the people.
(Bukhari and Muslim.)