Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.2.2

6.7.2.2

dṛśāno rukbha urvyā vyadyauditi | dṛśyamāno hyeṣa rukbha urvyā vidyotate durmarṣamāyuḥ śriye rucāna iti durmaraṃ vā etasyāyuḥ śriyo eṣa rocate 'gniramṛto abhavadvayobhiriti sarvairvā eṣa vayobhiramṛto 'bhavadyadenaṃ dyaurajanayaditi dyaurvā etamajanayatsuretā iti suretā hyeṣā yasyā eṣa retaḥ

[Vâg. S. XII, 1; Rik S. X, 45, 8] 'Looking like a golden disk he hath shone far and wide,'--for that gold plate, being seen, indeed shines far and wide;--'flashing forth unquenchable life for glory,'--for not easily dying is his (Agni's) life (vital power); and for glory he does shine;--'Agni became immortal by his powers, when Dyaus bore him--,' for Dyaus (the sky) did bear him;--'she that hath good seed--,' for good seed indeed she has whose seed he (Agni) is.