अथ यां चतुर्थीं जुहुयात्तां जुहुयात्समानाय स्वाहेति समानस्तृप्यति ॥ ५.२२.१ ॥
atha yāṃ caturthīṃ juhuyāttāṃ juhuyātsamānāya svāheti samānastṛpyati || 5.22.1 ||
1. When he [the eater] offers the fourth oblation, he offers it saying, ‘Samānāya svāhā’ [I offer this as an oblation to samāna]. With this, samāna becomes pleased.
Atha, next; yām caturthīm juhuyāt, when he offers the fourth [oblation]; tām juhuyāt, he offers that; samānāya svāhā iti, [with the mantra] ‘Samānāya svāhā’; samānaḥ tṛpyati, [then] samāna is pleased.
Samāna is the aspect of the vital force responsible for digestion and assimilation of food.