The serpent brothers of Narmadā gave Narmadā to Purukutsa. Being sent by Vāsuki, she took Purukutsa to the lower region of the universe.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नर्मदा भ्रातृभिर्दत्ता पुरुकुत्साय योरगैः । तया रसातलं नीतो भुजगेन्द्रप्रयुक्तया
narmadā bhrātṛbhirdattā purukutsāya yoragaiḥ | tayā rasātalaṃ nīto bhujagendraprayuktayā
SB 9.7.2