Skandapurana 6.3.49.13

6.3.49.13

dvitīyaḥ saṅgamastatra yathā veṇyāṃ sitāsitaḥ .
tatra brahmā svayaṃ devo brahmeśaṃ liṅgamuttamam .. 49.13 ..

A second confluence is there, like the dark and white [waters] at the Veṇī;
there, the god Brahmā himself [consecrated] the excellent liṅga Brahmeśa.