'Strength Fails' in the Bible

For my life is spent with grief, and my years with sighing: my strength fails because of my iniquity, and my bones are consumed.

My heart pants, my strength fails me: as for the light of my eyes, it also is gone from me.

Cast me not off in the time of old age; forsake me not when my strength fails.

The blacksmith with the tongs works in the coals, and fashions it with hammers, and works it with the strength of his arms: yea, he is hungry, and his strength fails: he drinks no water, and is faint.