Shiva Purana
परस्तात्परमात्मेति ब्रह्मविष्णुमहेश्वराः ॥ वर्तन्ते वसवः केचित्परमात्मपदाश्रयाः ॥ ६७ ॥
Brahmā, Viṣṇu and Maheśvara are the Supreme Souls. There are some Vasus who take refuge in the feet of the Supreme Soul.
english translation
parastAtparamAtmeti brahmaviSNumahezvarAH ॥ vartante vasavaH kecitparamAtmapadAzrayAH ॥ 67 ॥
hk transliteration by Sanscript