Jaiminīya Upaniṣad Brāhmaṇa 2.3.5

2.3.5

taṃ vācopasamaipsan
te vācaṃ samārohan
teṣāṃ vācam paryādatta
tasmāt paryādattā vāk
satyaṃ ca hy enayā vadaty anṛtaṃ ca /

They desired to reach it through speech;
they mounted speech;
he took hold around their speech;
therefore speech is taken hold of around;
for with it one speaks both truth and untruth.