Padma Purana 6.1.18

Padmapurāṇa 6.1.18

idaṃpavitraṃparamaṃpuṇyamāyuṣyavardhanam
paṭhitavyaṃviśeṣeṇaviṣṇoḥ sāyujyamāpnuyāt