'Fails' in the Bible

For evils without number have encompassed me. My iniquities have overtaken me, so that I am not able to see. They are more than the hairs of my head, and my heart fails me.

(since the redemption price for their life is costly and it always fails),

Do not cast me away in the time of old age; when my strength fails do not abandon me.

My soul longs and even fails for the courtyards of Yahweh. My heart and flesh sing for joy to the living God.

Quickly answer me, O Yahweh; my spirit fails. Do not hide your face from me, or I will become like [those] descending to [the] pit.