In the Quraan Majeed, Allah Ta‘ala mentions that one of the qualities of the true believers is:
وَمِمّا رَزَقنـٰهُم يُنفِقونَ ﴿البقرة:٣﴾
They (the believers who believe in the unseen) spend from what We have bestowed upon them
Regarding this verse of the Quraan Majeed, Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) once mentioned the following: There is no reason to restrict the spending mentioned in this verse to the spending of wealth. Rather, it may refer to assisting the servants of Allah Ta‘ala through the bounties which Allah Ta‘ala has blessed us with. All the internal and external faculties which Allah Ta‘ala has bestowed upon us, such as our reasoning and intelligence, and our hands and feet, are the bounties of Allah Ta‘ala. Hence, to use these faculties for the sake of Deen, assisting people and other efforts that are pleasing to Allah Ta‘ala will also be included in this verse. (Malfoozaat Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) pg. 106)
Source: Ihyaauddeen.co.za