Paraskaragrihyasutra 1.15.8

1.15.8

niyuktāmapyeke gāthāmupodāharanti \ soma eva no rājemā mānuṣīḥ prajāḥ \ avimuktacakra āsīraṃstīre tubhyamasāviti yāṃ nadīmupā vasitā bhavati tasyā nāma gṛhṇāti \8\

Here some also prescribe a certain stanza (to be sung by the lute-players): 'Soma alone is our king. May these human tribes dwell on thy banks, O (river) whose dominion is unbroken, N.N.!'—here he names the name of the river near which they dwell.