Sahih Muslim Book 5, Hadith Number 2273.

Chapter : Disapproval of the longing for the (possessions of the material) world.

Salim b. ‘Abdullah reported on the authority of his father that the Messenger of Allah (may peace be upon him) gave to ‘Umar b. Khattab some gift. Umar said to him: Messenger of Allah, give it to one who needs it more than I. Upon this the Messenger of Allah (may peace be upon him) said: Take it; either keep it with you or give it as a charity, and whatever comes to you in the form of this type of wealth, without your being avaricious or begging for it, accept it, but in other circumstances do not let your heart hanker after it. And it was on account of this that Ibn ‘Umar never begged anything from anyone, nor refused anything given to him.