Skandapurana 6.3.90.74

6.3.90.74

māsānāṃ mārgaśīrṣo'sti nadīnāṃ narmadā yathā .
māsi mārgaśire pārtha hyekādaśyāṃ site'hani .. 90.74 ..

just as Mārgaśīrṣa is among the months, and the Narmadā among the rivers, / [so it is with this tīrtha]. In the month of Mārgaśīrṣa, O son of Pṛthā, on the eleventh day of the bright fortnight,