By Allah, it is not poverty about which I fear for you, but I fear in your case that (the worldly) riches may be given to you as were given to those who had gone before you, and that you begin to vie with one another for them as they vied for them, and that they may destroy you as they destroyed them. [Al-Bukhari]
O son of Adam! It is better for you if you spend your surplus (wealth), but if you withhold it, it is evil for you. There is (however) no reproach for you (if you withhold the essentials) for a living. And begin (charity) with your dependents; and the upper hand is better than the lower hand. [Muslim]
If anyone gives as sadaqa (charity) the equivalent of a date from that (earning) earned honestly, for Allah accepts that which is lawful, the Lord would accept it with His Right Hand, and even if it is a date, it would foster in the Hand of the lord, as one of you fosters his colt, till it becomes bigger than a mountain.
Nothing is more delighting to me than this that Uhud should be of gold for me, and no dinar is left with me out of it before three nights pass except a dinar which I would set aside for the repayment of debt upon me. [Al-Bukhari]