Jaiminīya Upaniṣad Brāhmaṇa 1.45.6

1.45.6

tad etad abhrātṛvyaṃ sāma
na ha vā indraḥ kaṃ cana bhrātṛvyam paśyate
sa yathendro na kaṃ cana bhrātṛvyam paśyata evam eva na kaṃ cana bhrātṛvyam paśyate ya etad evaṃ vedātho yasyaivaṃ vidvān udgāyati /
caturdaśe 'nuvāke caturthaḥ khaṇḍaḥ
caturdaśo 'nuvākas samāptaḥ //

That is this sāman without a rival. Indra sees no rival at all. Just as Indra sees no rival, so one who knows this thus sees no rival at all; and likewise [he does not] for whom one who knows thus sings the udgītha.
Fourth khaṇḍa in the fourteenth anuvāka.
The fourteenth anuvāka is completed.