'Thousands' in the Bible

So I took the leaders of your tribes, wise and experienced men, and made them leaders over you, commanders of thousands, and hundreds, and fifties, and tens, and officers (administrators) for your tribes.

but showing graciousness and lovingkindness to thousands [of generations] of those who love Me and keep My commandments.

He said,“The Lord came from Sinai,And dawned on them from Seir;He shone forth from Mount Paran,And He came from among ten thousand holy ones;At His right hand was a flaming fire, a law, for them.

“His majesty is like a firstborn young bull,And his horns like the horns of the wild ox;With them he will gore the peoples,All of them together, to the ends of the earth.And those are the ten thousands of Ephraim,And those are the thousands of Manasseh.”