Khandogya-Upanishad: Fifth Prapathaka, Twenty-Third Khanda
1. “And he who offers the fifth oblation, should offer it to Udana (out-breathing), saying Svaha. Then Udana is satisfied,
2. “If Udana is satisfied, Vayu (air) is satisfied, if Vayu is satisfied, ether is satisfied, if ether is satisfied, whatever is under Vayu and under the ether is satisfied. And through their satisfaction he (the sacrificer or eater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.