Mahabharata 12.174.17

समुन्नमग्रतो वस्त्रं पश्चाच्छुध्यति कर्मणाउपवासैः प्रतप्तानां दीर्घं सुखमनन्तकम्

samunnamagrato vastraṃ paścācchudhyati karmaṇāupavāsaiḥ prataptānāṃ dīrghaṃ sukhamanantakam

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