Jaiminīya Upaniṣad Brāhmaṇa 2.3.9

2.3.9

tam apānenopasamaipsan
te 'pānaṃ samārohan
teṣām apānam paryādatta
tasmāt paryātto 'pānaḥ
surabhi ca hy enena jighrati durgandhi ca /

They desired to reach it through downward breath;
they mounted downward breath;
he took hold around their downward breath;
therefore downward breath is taken hold of around;
for with it one smells both fragrant and foul odors.