4.4

Translation by Swami Sivananda
4 Samana is so called because it distributes equally the two oblations, namely, the out breathing and the in breathing; it is the priest. The mind, verily, is the sacrificer. Udana is the fruit of the sacrifice, because it leads the sacrificer every day, in deep sleep, to Brahman. 

Translation by Max Mueller
4. Because it carries equally these two oblations, the out-breathing and the in-breathing, the Samâna is he (the Hotri priest). The mind is the sacrificer, the Udâna is the reward of the sacrifice, and it leads the sacrificer every day (in deep sleep) to Brahman.