Mahabharata 5.81.26

मन्त्राहुतिमहाहोमैर्हूयमानश्च पावकःप्रदक्षिणशिखो भूत्वा विधूमः समपद्यत

mantrāhutimahāhomairhūyamānaśca pāvakaḥpradakṣiṇaśikho bhūtvā vidhūmaḥ samapadyata

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