Jaiminīya Upaniṣad Brāhmaṇa 2.4.3

2.4.3

taṃ haitam udgīthaṃ śāṭyāyanir ācaṣṭe vaśī dīptāgra iti
dīptāgrā ha vā asya kīrtir bhavati ya evaṃ veda /

Śāṭyāyani proclaims this udgītha as 'controlling, with a blazing point';
blazing at the point indeed becomes the fame of him who knows thus.