'Fail' in the Bible

Now therefore, O Jehovah, the God of Israel, keep with thy servant David my father that which thou hast promised him, saying, There shall not fail thee a man in my sight to sit on the throne of Israel, if only thy children take heed to their way, to walk in my law as thou hast walked before me.

then I will establish the throne of thy kingdom, according as I covenanted with David thy father, saying, There shall not fail thee a man to be ruler in Israel.