A man came to the Prophet, peace be upon him, and said: 'O Messenger of Allah, I have wealth and children, and my father wants to take all of my wealth.' The Prophet said, 'You and your wealth are for your father. Your children are among your best earnings, so take from what your children earn.'
(Imam Ahmad, Abu Dawud, Ibn Majah)

Imam al-Khattabi commented: "He wants to take all my wealth means that he wanted to take it all and leave nothing. It appears that the reason why the man asked this question was that he was having to spend on his father, and the amount required would consume all of his wealth, not just what he had to spare. The Prophet did not give him the permission to stop spending on his father, but told him, 'You and your wealth are for your father,' which means that if your father needed all of your wealth, he will take as much as he needs, as if he were taking from his own wealth. If you do not have any accumulated wealth, but you have an income, you should earn money and spend it on him."