Who says the following and why?
"And Mentor took command—I saw him climb aboard— or a god who looked just like Mentor head to foot, and that's what I find strange. I saw good Mentor yesterday, just at sunup, here. But clearly he boarded ship for Pylos days ago." *
Noemon is warning the suitors that a god is on Telemachus's side.

Noemon is trying to find his ship. By ignoring his warning, the suitors show their impious nature, a foreshadowing of their fate.

Noemon, Antinous, and Eurymachus are plotting to kill Telemachus.

Noemon is making conversation. He needs to talk to Mentor about getting one of his horses back from Elis Plain.

In Book IV of "The Odyssey" by Homer, we see the character of Noemon telling Antinous and the other suitors about Telemachus leaving without their knowledge on his ship. He thought that since he saw Mentor the day before, they must have returned, He wants to find his ship so that he will be able to go to Elis. When asked who had accompanied Telemachus, he mentioned the presence of Mentor, who was in fact the goddess Athene under a disguise. This scene foreshadows the future of the suitors who were enjoying and harassing Penelope, Odysseus's wife and Telemachus's mother. And by ignoring Noemon's warning about the presence of a god on Telemachus's side, the suitors are showing their impious nature, which will also be their downfall.