'Fail' in the Bible

for Jehovah thy God is a merciful God; he will not fail thee, neither destroy thee, nor forget the covenant of thy fathers which he sware unto them.

Thy sons and thy daughters shall be given unto another people; and thine eyes shall look, and fail with longing for them all the day: and there shall be nought in the power of thy hand.

Be strong and of good courage, fear not, nor be affrighted at them: for Jehovah thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee.

And Jehovah, he it is that doth go before thee; he will be with thee, he will not fail thee, neither forsake thee: fear not, neither be dismayed.