kalmaṣhāḥ

अपाने जुह्वति प्राण प्राणेऽपानं तथाऽपरे

kalmaṣhāḥ — of impurities

Others offer the outgoing breath into the incoming, and the incoming into the outgoing, holding both still, intent on the breath.

तद्बुद्धयस्तदात्मानस्तन्निष्ठास्तत्परायणाः

kalmaṣhāḥ — sins

With understanding turned there, self given there, established there, intent on that — they go where there is no returning, their faults washed away by knowledge.

युञ्जन्नेवं सदाऽऽत्मानं योगी विगतकल्मषः

kalmaṣhaḥ — sins

Keeping the self constantly so joined, freed of faults, the practitioner easily reaches the boundless happiness of touching Brahman.