Shiva Purana
वरुणः सरितां नाथो गंगादिसरिता गणैः ॥ महाबलं च सेवन्ते पश्चिमद्वारमाश्रिताः॥ १८॥
Varuṇa, the lord of all rivers, along with the rivers Gaṅgā etc. resort to the western gate and serve Mahābala.
english translation
varuNaH saritAM nAtho gaMgAdisaritA gaNaiH ॥ mahAbalaM ca sevante pazcimadvAramAzritAH॥ 18॥
hk transliteration by Sanscript