Joseph Benson's Commentary of the Old and New Testaments - Psalms 109:24-25
Psalms 109:24-25 . My knees are weak through fasting Either through forced fasting for want of food, when he was persecuted, or for want of appetite when he was sick, or through voluntary fasting, which the frequency and long continuance of his sufferings induced him to use. I became also a reproach unto them Instead of that pity, which either religion or humanity should have taught them to exercise toward a person in extreme misery, they loaded me with reproaches and scorns. They shaked... read more
Albert Barnes' Notes on the Whole Bible - Psalms 109:24
My knees are weak through fasting - Hunger; want of food. Strength to stand is connected with firmness in the knee-joints, and hence, weakness and feebleness are denoted by the giving way of the knees. Compare Hebrews 12:12.And my flesh faileth of fatness - I am lean and weak. There is not the proper supply for my strength. The idea seems to have been that fatness (Hebrew, oil) was necessary to strength. read more