अथ यां पञ्चमीं जुहुयात्तां जुहुयादुदानाय स्वाहेत्युदानस्तृप्यति ॥ ५.२३.१ ॥
atha yāṃ pañcamīṃ juhuyāttāṃ juhuyādudānāya svāhetyudānastṛpyati || 5.23.1 ||
1. When he [the eater] offers the fifth oblation, he offers it saying, ‘Udānāya svāhā’ [I offer this as an oblation to udāna]. With this, udāna becomes pleased.
Atha, next; yām pañcamīm juhuyāṭ when he offers the fifth [oblation]; tām juhuyāt, he offers that; udānāya svāhā iti, [with the mantra] ‘Udānāya svāhā’; udānaḥ tṛpyati, [then] udāna is pleased.
Udāna is the aspect of the vital force responsible for helping the individual self leave the body at the time of death.