Śāṅkhāyana (Kauṣītaki) Āraṇyaka 2.15

2.15

ŚĀ 2,15
athaitam ānuṣṭubhaṃ samāmnāyaṃ śaṃsati | vāg vā etad ahar vāg anuṣṭub vācyeva tad vācaṃ pratiṣṭhāpayati | divaṃ yayeti devān evaitena sūktenaiti | sa pratnathā kavivṛdha iti tṛcam arkavat tena samṛddham | gāyatryuttamā tayā samṛddham | śāsa itthā mahāṁ asīti mahadvat | mahadvad dhyetad ahaḥ ||

ŚĀ 2.15
Then he recites this collection in the Anuṣṭubh metre. Speech indeed is this day; speech is the Anuṣṭubh; thus he establishes speech in speech. With [the hymn beginning], 'They went to heaven,' he reaches the gods by means of this hymn. The triplet, 'He in the ancient manner, the increaser of sages,' contains [the word] 'arka'; thereby it is successful. The final [verse] is in Gāyatrī metre; thereby it is successful. 'Rule in this manner, great art thou' contains [the word] 'great.' For great indeed is this day.