"And give them [your slaves seeking freedom] something out of the wealth which Allaah has bestowed upon you." [Sooratun-Noor, 24:33]
Allaah سبحانه وتعالى also says,
"Believe in Allah and His Messenger and spend out of that in which He has made you successors. For those who have believed among you and spent, there will be a great reward." [Sooratul-Hadeed, 57:7]
In reality, the wealth that Allaah سبحانه وتعالى gives a person is a trial while the poverty that a person experiences is also a trial. Sometimes, the test of "having" is much more difficult than the test of "not having." When one is a have-not, one may not have many options available to him save to remain patient and put one's hope in Allaah سبحانه وتعالى to make thing better. However, when one has wealth, many doors of disobedience to Allaah سبحانه وتعالى can be opened for him. Hence, this can be a very difficult trial. He may only be successful in such a trial if he has some training that develops within him the proper discipline and self-control. This training should remind him of where that wealth came from in the first place - from Allaah سبحانه وتعالى - and what a wonderful bounty it is, reminding him that many people are without that bounty. This will make him realise how important it is for him to use that wealth in a proper manner. This training and development of will power is provided for him in the obligation of Zakah.
[Purification of the Soul]
