Psalm 109:24 in the World English Bible
My knees are weak through fasting. My body is thin and lacks fat.
Context
23 I am gone like the shadow when it declineth: I am tossed up and down as the locust.
24 My knees are weak through fasting; and my flesh faileth of fatness.
25 I became also a reproach unto them: when they looked upon me they shaked their heads.