Upon the Authority of Abu Huraira – Radhiyallahu ‘Anhu who said: The messenger – Sallallahu ‘Alaihi Was Salam
“No one gives Sadaqah from that which is good – and Allah only accepts that which is good – except that Ar Rahmaan (the most beneficent) takes it with his right hand, even if it is a date. It is then nurtured in the hand of Ar Rahmaan until it becomes greater than a mountain. Just as one of you would nurture his colt or his young (weaned) Camel“
(Agreed upon by Bukhaari (1344) and Muslim (1014))
In variant wording:
Upon the authority of Aisha – Radhiyallahu ‘Anhaa – that the messenger of Allah – Sallallahu ‘alaihi wa Salam – said
“Indeed Allah nurtures for one of you the date and the morsel (that you give in charity) just as one of you nurtures his colt or young camel until it (the charity) becomes like (Mount) Uhud“
(Collected by Ibn Hibbaan 3302)
“In it is an indication of the fact that it will not be accepted if it is not Halaal. Al Qurtubi mentions: “Indeed Allah does not accept Charity from haraam, since it is not the possession of the one who gives it as charity.Thus he is prohibited from utilising it. So when the one who spends in charity is utilising what he is spending, if it were to be accepted from him, it would necessitate that it (i.e that charity) would be legislated and prohibited at the same time and that is impossible“
