Mahabharata 3.203.23

अपानोदानयोर्मध्ये प्राणव्यानौ समाहितौसमन्वितस्त्वधिष्ठानं सम्यक्पचति पावकः

apānodānayormadhye prāṇavyānau samāhitausamanvitastvadhiṣṭhānaṃ samyakpacati pāvakaḥ

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