Generosity as the willingness to give Freely — Islam encourages this concept of generosity so much so that it is embedded in one of the Five pillars of Islam, the obligatory charity known as Zakat.
In Arabic, the term Zakat literally means purification of the heart however; it is also the payment, From surplus money, of an obligatory charity designed by God to provide For all the needy members of the community. It is a Fixed calculable amount.
There is also another Form of generosity in Islam called Sadaqah (optional charity).Linguistically, Sadaqah means Truthfulness, and some scholars have described it as the heart being Truthful to its Creator.Anything given generously — Freely to others — with the intention of pleasing God is Sadaqah.