'Lengthen' in the Bible

If you will walk in my ways, to keep my statutes and my commandments, as your father David walked, then I will lengthen your days."

But it shall not be well with the wicked, neither shall he lengthen days like a shadow; because he doesn't fear God.

"Enlarge the place of your tent, and let them stretch forth the curtains of your habitations; don't spare: lengthen your cords, and strengthen your stakes.