'Nations' in the Bible

Now if You slay this people as one man, then the nations who have heard of Your fame will say,

“As I see him from the top of the rocks,And I look at him from the hills;Behold, a people who dwells apart,And will not be reckoned among the nations.

“God brings him out of Egypt,He is for him like the horns of the wild ox.He will devour the nations who are his adversaries,And will crush their bones in pieces,And shatter them with his arrows.

And he looked at Amalek and took up his discourse and said,“Amalek was the first of the nations,But his end shall be destruction.”