Skandapurana 6.3.111.21

6.3.111.21

dṛṣṭvā tā āgatāḥ sarvā gaṅgāgarbhe mahāmateḥ .
ṣaṇmukhaiḥ ṣaṇmukho bhūtvā pipāsurapibatstanam .. 111.21 ..

Seeing that they had all arrived, the noble-minded one, born of Gaṅgā's womb, / became six-faced and drank the breast-milk with six mouths, longing to drink.