कावषेयः प्रजापतेः प्रजापतिर्ब्रह्मणो ब्रह्मस्वयंभु ब्रह्मणे नमः ॥ ४ ॥
In plain words
Kāvaṣeya learned it from Prajāpati; Prajāpati from Brahman itself. Brahman needs no cause — it simply is. Homage to Brahman.
Close to the Sanskrit
Kāvaṣeya [received it] from Prajāpati; Prajāpati from Brahman; Brahman is self-existent; salutation to Brahman.