Śatapatha Brāhmaṇa ("of a hundred paths") 6.4.2.3

6.4.2.3

tamu tvā dadhyaṅṅṛṣiḥ | putra īdhe atharvaṇa iti vāgvai dadhyaṅṅātharvaṇaḥ sa enaṃ tata ainddha vṛtrahaṇam puraṃdaramiti pāpmā vai vṛtraḥ pāpmahanam puraṃdaramityetat

[Vâg. S. XI, 33; Rik S. VI, 16, 14] 'Also the sage Dadhyañk, the son of Atharvan, kindled thee;'--Dadhyañk, the Âtharvana, doubtless is speech; and he did kindle him therefrom;--'as the Vritra-slayer, the breaker of strongholds,'--Vritra is evil, thus: 'as the slayer of evil, the breaker of strongholds.'