'Thousand' in the Bible

(The LORD God of your fathers make you a thousand times so many more as ye are, and bless you, as he hath promised you!)

Know therefore that the LORD thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;

How should one chase a thousand, and two put ten thousand to flight, except their Rock had sold them, and the LORD had shut them up?