'Fail' in the Bible

"Why do you see the speck in your brother's eye but fail to notice the beam in your own eye?

Sell what ye possess and give alms; make to yourselves purses which do not grow old, a treasure which does not fail in the heavens, where thief does not draw near nor moth destroy.

And I say unto you, Make to yourselves friends of the mammon of unrighteousness; that, when ye fail, they may receive you into everlasting habitations.

And it is easier for heaven and earth to pass, than one tittle of the law to fail.

But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.