'Thousand' in the Bible

Jehovah, the God of your fathers, make you a thousand times so many more as ye are, and bless you as he hath said unto you!

And thou shalt know that Jehovah thy God, he is God, the faithful God, who keepeth covenant and mercy to a thousand generations with them that love him and keep his commandments;

How could one chase a thousand, And two put ten thousand to flight, Were it not that their Rock had sold them, And Jehovah had delivered them up?