Shatapatha Brahmana 1.4.1.29

1.4.1.29

so nvāha | iḍenyo namasya itīḍenyo hyeṣa namasyo hyeṣatirastamāṃsi darṣata iti tira iva hyeṣa tamāṃsi samiddho dadṛśe samagniridhyate vṛṣeti saṃ hīdhyate vṛṣā vṛṣo agniḥ samidhyata iti saṃ hīdhyate

He recites (the fifth sâmidhenî): 'Praiseworthy he, adorable,' for worthy of praise he is, and worthy of adoration;--'visible through the veil of gloom,' for when kindled he is seen right through the gloom;--'Agni, the mighty one (bull), is lit,' for he is indeed lit up, the mighty one.
[He recites the sixth sâmidhenî]: 'The mighty Agni is lit up,' for he is indeed lit up.