Jaiminīya Upaniṣad Brāhmaṇa 2.13.3

2.13.3

tām etāṃ vācaṃ yathā dhenuṃ vatsenopasṛjya prattāṃ duhītaivam eva devā vācaṃ sarvān kāmān aduhran /

Just as one would milk that speech, having brought the calf near like a cow, when she has yielded [her milk], even so the gods milked all desires from speech.