Atharva Veda 6.51: A prayer for purification and forgiveness of sins

Cleansed by the filter of the Wind comes Soma past all our enemies, meet friend of Indra.

May the maternal Waters make us ready: cleanse us with fat-ness they who cleanse with fatness!
The Goddesses bear off each blot and tarnish: I come forth from the waters cleansed and stainless.

O Varuna, whatever the offence may be, the sin which men commit against the heavenly folk— When, through our want of thought we violate thy laws, punish us not, O God, for that iniquity.