The first reward granted to those who swallow their anger is that they shall have protection on the Day of Resurrection.

If Allah was to grant a person protection on the Day of Resurrection, which is also the day known as: The Day of Grief; The Day of Everything in the Open; The Day of Trepidation; The Day of the Great Fear; and The Day of the Distress, then is there any greater blessing or gift?!

In the same way, if a person was to possess the entire transient world, however did not possess tranquillity and peace in his heart, then all of his material possessions would mean nothing!

Thus, if one has peace of heart and mind, however has nothing from the material aspect of this world, then in reality, he has everything!

The second reward is that such a person shall be granted true faith in Allah while in this world.

It has been mentioned that if a person was to refrain from certain sins, then Allah would grant that person true faith that he could 'taste' - this means that his faith would not be something dry and monotonous in theory. Rather, there would be sweetness in his faith which he could actually sense! This is not something granted to all people - it is only bestowed upon those who stand firm in the face of their lower desires.

We have traditions which states if a person's eyes fall upon a beautiful woman who is not his mahram and he immediately turns his eyes away from her, then Allah would grant that person such a level of faith that the person would actually be able to taste it (the true faith)!