'Fail' in the Bible

Now, O Lord God of Israel, keep the promise you made to your servant, my father David, when you said, 'You will never fail to have a successor ruling before me on the throne of Israel, provided that your descendants watch their step and obey my law as you have done.'

Then I will establish your dynasty, just as I promised your father David, 'You will not fail to have a successor ruling over Israel.'

"But if you people ever turn away from me, fail to obey the regulations and rules I instructed you to keep, and decide to serve and worship other gods,

Whenever your countrymen who live in the cities bring a case before you (whether it involves a violent crime or other matters related to the law, commandments, rules, and regulations), warn them that they must not sin against the Lord. If you fail to do so, God will be angry with you and your colleagues; but if you obey, you will be free of guilt.