ऽप्रिया भ्रातृव्या' ।स यश्चाय पुरुषे ।य-श्चासावादित्ये ।स एक ॥ ४ ॥
In plain words
...unfriendly rivals. He who is present here within the human person, and he who is yonder within the sun—that is one single reality.
Close to the Sanskrit
...unfriendly rivals. He who is this in man and who is that yonder in the sun, he is one.