Skandapurana 5.199.37

5.199.37

.. viśvāmitra uvāca .. ..
etatte sarvamākhyātaṃ yatpṛṣṭo'smi nṛpottama ..
śrāddhārhā nāgarā yena nāgarāṇāṃ vyavasthitāḥ ..
bhartṛyajñena maryādā kṛtā teṣāṃ yathā purā .. 37 ..

Viśvāmitra said: / All this has been related to you as I was asked, O best of kings, / by which the Nāgaras are determined as worthy of ancestral rites among the Nāgaras, / just as their rule was established by Bhartṛyajña long ago.