Blessings of giving pure wealth in charity
There is great importance of those who spend in the path of Allah with sincerity. Allah Most High accepts their charity. Be it even only a small date, with Allah Most High it is as great as a mountain. There is a Hadith in Jame’ Tirmidhi:
Translation: It has been narrated on the authority of Hadhrat Sa‘eed (May Allah be well pleased with him) that he heard Hadhrat Abu Hurairah (May Allah be well pleased with him) say that the Holy Prophet (Sallallahu alaihi wa sallam) said: None of you gives any charity from pure (lawfully earned) wealth but that Allah Most High accepts it in His hand (shows special favor to it).
Allah Most High accepts only pure wealth even though it may be only a single date. Then it grows in the hand of Allah Most High, so much so that it becomes bigger than a mountain, the way any of you rears a calf. (Jame’ Tirmidhi, Hadith No. 663)