Who says the following and why?

"That's why noble Eurytus died a sudden death:
no old age, creeping upon him in his halls . . .
Apollo shot him down, enraged that the man
had challenged him, the Archer God." *

Demodocus is warning Broadsea to not anger "god-like" Odysseus.
Demodocus is warning Odysseus to temper his ego so he does not anger the gods.
Odysseus is teaching Broadsea an important lesson in humility.