yāsām ambhaḥ pavitram amalam upayuñjānāḥ puruṣa-ṛṣabha- draviṇa-devaka-saṁjñā varṣa-puruṣā āpomayaṁ devam apāṁ pūrṇenāñjalinā yajante.

yasam-of all the rivers; ambhah-the water; pavitram-very sanctified; amalam-very clean; upayunjanah-using; purusa-Purusa; rsabha-Rsabha; dravina-Dravina; devaka-Devaka; samjnah-endowed with the names; varsa-purusah-the inhabitants of those varsas; apah-mayam-Varuna, the lord of water; devam-as the worshipable deity; apam-of water; purnena-with full; anjalina-folded palms; yajante-do worship.