gītā dhyāna - Verse śloka 4
śloka 4
sarvopaniṣado gau dogdhā gopālanandanaḥ
pārtho vatsaḥ sudhīrbhoktā dugdhaṃ gītāmṛtaṃ mahat
Translation
All the Upanishads are the cows, the cowherd is Shri Krishna, the calf is Arjuna, and the milk is the nectar of the Gita; those who partake of it become wise.