Mukhtasar Bukhari (Abridged) 709 — Charity should be given from pure

Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever gives charity equal to a date from his pure earnings—and Allah accepts only that which is pure—then Allah takes it in His right hand and nurtures it for the giver, just as one of you nurtures his child, until that charity becomes like a mountain."