Hebrews 12:12

Therefore 'lift again the down-dropped hands and straighten the weakened knees;

Matthew 4:2

And, after he had fasted for forty days and forty nights, he became hungry.

2 Corinthians 11:27

I have been through toil and hardship. I have passed many a sleepless night; I have endured hunger and thirst; I have often been without food; I have known 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, after he had fasted for forty days and forty nights, he became hungry.
2 Corinthians 11:27
I have been through toil and hardship. I have passed many a sleepless night; I have endured hunger and thirst; I have often been without food; I have known cold and nakedness.
Hebrews 12:12
Therefore 'lift again the down-dropped hands and straighten the weakened knees;