Is the reward for charity calculated by the value of the money, or by the size of the items purchased with the money, or by the extent of the benefit achieved through it?

Charity is preferred when there is a need and benefit, such as feeding a hungry person. It is recommended to delay giving charity if doing so increases its benefit, for the greater the need, the more confirmed the charity. Increasing the amount of charity increases the reward. In the first example, satisfying a poor person's hunger is more important than buying sweets. In the second example, those in charge of the mosque should be asked what is more difficult to obtain between iron and cement, and spending on that is more preferable. If they are equal, then buying iron is more preferable because it lasts longer, and thus its reward is more enduring.