Hebrews 12:12

Therefore, [Prov. 4:26 says], "Strengthen your limp hands and weak knees;

Matthew 4:2

After He had fasted forty days and nights, He was [very] hungry.

2 Corinthians 11:27

I have worked and suffered. I have often gone without sleep, been hungry and thirsty, often gone without food [i.e., for spiritual reasons], been cold and had inadequate clothing.

Treasury of Scripture Knowledge

Summary

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

Bible References

Knees

Matthew 4:2
After He had fasted forty days and nights, He was [very] hungry.
2 Corinthians 11:27
I have worked and suffered. I have often gone without sleep, been hungry and thirsty, often gone without food [i.e., for spiritual reasons], been cold and had inadequate clothing.
Hebrews 12:12
Therefore, [Prov. 4:26 says], "Strengthen your limp hands and weak knees;