When a believer attains to this stage of faith...
When a believer attains to this stage of faith, his heart is never assailed by any doubt or confusion; he does not take a dim view of whatever befalls him, nor is he offended if afflicted with a misfortune. After this description, Allah (swt) mentions some of his deeds, i.e. charity - prayers - etc. Lastly, the verse cites some of their excellent moral characteristics i.e. keeping of their promises, and the patient in distress and affliction .
The Holy Prophet (S) said that whoever acts up to this one verse has attained to perfection in faith. The theories and the practices given here are the real virtues which apart from being ordered by God, appeal as well to human reasoning.
As regards spending in the way of God, while Islam does not demand absolute hatred or indifference to property or the other things of earthly value, but the subordination of the possessions of the spirit of charity, treating oneself only as a trustee charged with the prescribed duties as regulated and prescribed by God through His apostle Muhammad. Charity in Islam is also regulated and ranked: Firstly - to the nearest in the relations. Secondly - to the helpless orphans. Thirdly - to the poor.
Fourthly - to the helpless wayfarers. Fifthly - to the captives or the slaves in getting them liberated. Any intelligent reader of this verse will find all these superb qualities in their perfection or completeness only in the Holy Prophet (S) and the Twelve Imams (a), and it is left to every one of the readers of this Holy Book to see if history can present any one else of any other religions, with all these qualities of faith of God.
This is a very important verse particularly for those who sincerely long to have the correct lead or guidance to truth and the truthful ones. The Muslim world as a whole without any exception of any school of thought in it, know the fact and acknowledges it unreservedly that for the wonderful qualities of divine excellence, it was only ALI who earned exclusively for himself the unique title of “Madh-harul Ajaib” i.e. the Manifestation of Wonders.