Hebrews 12:12

Wherefore, lift up the hands that hang down, and strengthen the feeble knees,

Matthew 4:2

And when he had fasted forty days and forty nights, he was afterward hungry.

2 Corinthians 11:27

in weariness and in toil, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness:

Treasury of Scripture Knowledge

Summary

My knees are weak through fasting; and my flesh faileth of fatness.

Bible References

Knees

Matthew 4:2
And when he had fasted forty days and forty nights, he was afterward hungry.
2 Corinthians 11:27
in weariness and in toil, in watchings often, in hunger and thirst, in fastings often, in cold and nakedness:
Hebrews 12:12
Wherefore, lift up the hands that hang down, and strengthen the feeble knees,