Mahabharata 3.82.130

यत्र स्नात्वा कृतार्थोऽस्मीत्यात्मानमवगच्छतिषष्ठकालोपवासेन मुच्यते ब्रह्महत्यया

yatra snātvā kṛtārtho'smītyātmānamavagacchatiṣaṣṭhakālopavāsena mucyate brahmahatyayā

Our plain-language meaning of this verse is waiting for scholar review.