Brahma Purana 51.68

Brahmapurāṇa 51.68

tasmāj jyeṣṭhe prayatnena gantavyaṃ bho dvijottamāḥ
kṛtvā tasmin pañcatīrthaṃ draṣṭavyaḥ puruṣottamaḥ //