Brahma Purana 68.41

Brahmapurāṇa 68.41

puraṃ tu pañcamaṃ dīptaṃ padmarāgamayaṃ puram
ṣaṣṭhaṃ vajramayaṃ viprā vaidūryaṃ saptamaṃ puram //