Atharva Veda 3.13

yad adaḥ saṃprayatīr ahāv anadatā hate tasmād ā nadyo nāma stha tā vo nāmāni sindhavaḥ

To the waters

Since formerly (? adás), going forth together, ye resounded (nad) when the dragon was slain, thenceforth ye are streams (nadī́) by name: these are your names, O rivers.

yat preṣitā varuṇenācchībham samavalgata tad āpnod indro vo yatīs tasmād āpo anu ṣṭhana

When, sent forth by Varuna, ye thereupon (ā́t) quickly skipped (valg) together, then Indra obtained (āp) you as ye went; therefore are ye waters (ā́p) afterward.

apakāmaṃ syandamānā avīvarata vo hi kam indro vaḥ śaktibhir devīs tasmād vār nāma vo hitam

As ye were flowing perversely (apakāmám), since Indra verily hindered (var) you by his powers, you, ye divine ones, therefore the name water (vā́r) is assigned you.

ekaḥ vo devo 'py atiṣṭhat syandamānā yathāvaśam ud āniṣur mahīr iti tasmād udakam ucyate

The one god stood up to you, flowing at [your] will; "the great ones have breathed up (ud-an)," said he; therefore water (udaká) is [so] called.

āpo bhadrā ghṛtam id āpa āsann agnīṣomau bibhraty āpa it tāḥ tīvro raso madhupṛcām araṃgama ā mā prāṇena saha varcasā gamet

The waters [are] excellent; the waters verily were ghee; these waters verily bear Agni-and-Soma; may the strong (tīvrá) satisfying savor (rása) of the honey-mixed (-pṛc) come to me along with breath, with splendor.

ād it paśyāmy uta vā śṛṇomy ā mā ghoṣo gacchati vāṅ māsām manye bhejāno amṛtasya tarhi hiraṇyavarṇā atṛpaṃ yadā vaḥ

Then indeed I see, or also hear; unto me comes the noise, to me the voice of them; I think myself then to have partaken ambrosia (amṛ́ta) when, ye gold-colored ones, I have enjoyed (tṛp) you.

idaṃ va āpo hṛdayam ayaṃ vatsa ṛtāvarīḥ ihettham eta śakvarīr yatredaṃ veśayāmi vaḥ

This, O waters, [is] your heart, this your young (vatsá), ye righteous ones; come thus hither, ye mighty ones, where I now make you enter.