Vaishnava Samhita. Narasimha Mehta Charitam I. Vol III Book VI Chp 15 Shlokas 36 - 37

रुद्र उवाच 
एवमस्तु महाबुद्धे मम भक्तोसि बालक |
दर्शयामि महारासं सुराणामपि दुर्लभम्  ||
कृष्णाख्यं परमं ब्रह्म ममेष्टं दैवतं खलु |
तत्क्रीडति प्रेयसीभिः पावने यमुनातटे  ||

Shri Rudra said

Oh, wise one! You are blessed. You are My bhakta, my child! I shall indicate to you and make you understand the Rasaleela which is beyond the comprehension of even the bhaktas. Shri Krishna, the Supreme Being is My beloved. Godhead That Supreme Soul exhibits pastimes with the Gopis on the sacred bank of the Yamuna