Agniveshyagrihyasutra 1.6.1.12

1.6.1.12

idhmādevoddhṛtya dakṣiṇaṃ paridhimagniṃ cāntareṇa uttaraṃ paridhiṃ cāgniṃ cāntarena praṇītāpraṇayane 'nūyājārthaṃ cādadhāti \

Taking [two sticks] from the firewood bundle itself, he places [them] between the southern enclosing stick and the fire, and between the northern enclosing stick and the fire, at the bringing forward of the praṇītā waters, for the sake of the after-offerings.