'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?

How can you fail to understand that I wasn't talking to you about bread? Beware of the yeast of the Pharisees and Sadducees!"

Then said Jesus, "This night all of you will stumble and fail in your fidelity to me; for it is written, 'I will strike the Shepherd, and the sheep of the flock will be scattered in all directions.'

"All may stumble and fail," said Peter, "but I never will."