Skandapurana 7.13.p38

7.13.p38

vyāsa uvāca
kathaṃ tadabhavaddivyaṃ puriścandraṃ niveśanam .
sthānaṃ guhyaṃ maheśasya kathayasva dṛḍhavrata ..8.122.20 . .
sanatkumāra uvāca
atra13 te saṃpravakṣyāmi purāvṛttaṃ mahāmate .
yacchrutvā pāpakarmāpi gaccheta paramāṃ gatim . .21 . .
purābhūtāṃ mahātmānau naranārāyaṇāvṛṣī .
tābhyāṃ kāryeṇa devānāṃ brahmavadhyā kṛtā kila ..22..

Vyāsa said:
How did that celestial dwelling, Puriścandra,
become the secret abode of the Great Lord? Relate that, O one of steadfast vows.
Sanatkumāra said:
Here I shall relate to you an ancient event, O wise one,
hearing which even an evildoer may attain the supreme destination.
Formerly there were two seers of great soul, Nara and Nārāyaṇa;
for the sake of the gods' purpose, it is said, they committed the slaying of a brahmin.