Atharvaveda 4.15.9

4.15.9

ā́po vidyúd abhráṃ varṣáṃ sáṃ vo 'vantu sudā́nava útsā ajagarā́ utá |
marúdbhiḥ prácyutā meghā́ḥ prā́vantu pr̥thivī́m ánu ||9||

Waters, lightning, cloud, rain—let the liberal ones favor you, also the fountains, great serpents; let the clouds, started forward by the Maruts, show favor (pra-av) along the earth.
Ppp. begins with vātas instead of āpas, and omits (as in 7 a) vas in b; and, for the last two pādas, it reads prā pyāyasva pra pitṛsva saṁ bhūmiṁ payasā sṛja. The comm. again takes sudānavas as vocative, and makes the elements mentioned in a subjects of sam avantu; in d he reads plāvantu but regards it as for prā ’vantu ⌊parallel with palāyate etc. (W's Gram. §1087 c), for which he cites Pāṇini viii. 2. 19⌋.