Charity extinguishes sin as water extinguishes fire.

Muadh ibn Jabal - Sunan al-Tirmidhi

Give in charity even if it is with one date, for indeed it will satisfy the hungry and extinguish sin as water extinguishes fire.

Abu Hurairah - Musnad Ahmad

Whoever gives charity equal to a date from good earnings - and Allah does not accept except what is good - Allah will accept it with His Right Hand, then He will nurture it for its owner, as one of you nurtures his foal, until it becomes like a mountain.

Abu Hurairah - Sahih Bukhari & Muslim