ChU 5.21.1
अथ यां तृतीयां जुहुयात् तां जुहुयाद् अपानाय स्वाहेति । अपानस् तृप्यति
atha yāṃ tṛtīyāṃ juhuyāt tāṃ juhuyād apānāya svāheti | apānas tṛpyati
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
'And he who offers the third oblation, should offer it to Apâna (down-breathing), saying Svâhâ. Then Apâna is satisfied. If Apâna is satisfied, the tongue is satisfied, if the tongue is satisfied, Agni (fire) is satisfied, if Agni is satisfied, the earth is satisfied, if the earth is satisfied, whatever is under the earth and under fire is satisfied.
Translated by F. Max Müller