Skandapurana 6.3.227.8

6.3.227.8

yathā hi puruṣe devastraimūrtatvamupāśritaḥ .
brahmaviṣṇumaheśākhyaṃ na bhedastatra vai yathā .
tathā sarittraye pārtha bhedaṃ manasi mā kṛthāḥ .. 227.8 ..

Just as the god assumed a threefold form in the Supreme Being,
called Brahmā, Viṣṇu, and Maheśa, and just as there is indeed no difference among them,
so too, O son of Pṛthā, do not conceive any difference in mind among the triad of rivers.