'Failing' in the Bible

Be careful! Otherwise, you will forget the LORD your God by failing to keep his commands, ordinances, and statutes that I'm commanding you this day.

Among those nations you'll have no rest. There'll be no resting place for the soles of your feet. Instead, the LORD will give you an anxious heart, failing eyesight, and a despairing spirit.

Answer me quickly, LORD; my spirit is failing. Do not hide your face from me; otherwise, I will become like those who descend to the Pit,