Jaiminīya (Talavakāra) Brāhmaṇa 16.75.p1

16.75.p1

pari priyā divaḥ kavir
ityārbhavasya pavamānasya parivatīrgāyatryo bhavantyantasya rūpam
anto vā anuṣṭupchandasām
ānuṣṭubhametadahaḥ
prapra kṣayāya panyasa

'Round about the dear [seats] of heaven, the wise...'—for the Ārbhava Pavamāna, these are Gāyatrī verses containing [the word] 'round about' (pari), the form of the end. The Anuṣṭubh meter is indeed the end of the meters. This day is connected with the Anuṣṭubh meter. 'Forward, forward to the praise-worthy abode...'—with this, they attain the form of the introductory rite, for this day is introductory. 'He, the bright son, born, caused his two parents to shine upon what was born'—saying this, [the verses] contain forms of 'born' (jāna-). Thus they generate the Ṣoḍaśin from the third pressing.