Brahmandapurana 2.36.19

Brahmāṇḍapurāṇa 2.36.19

mahasranāmnāṃ puṇyānāṃ trirāvṛttyā tu yatphalam /
ekāvṛttyā tu kṛṣṇasya nāmaikaṃ tatprayacchati //