Charity extinguishes sin as water extinguishes fire.

Muadh ibn Jabal - Sunan al-Tirmidhi

Protect yourselves from the Fire, even if with half a date (in charity).

Adi ibn Hatim - Sahih Bukhari & Muslim

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