John Gill Commentary Psalms 109:24

"My knees are weak through fasting; And my flesh faileth of fatness." — Psalms 109:24 (ASV)

My knees are weak through fasting
Either voluntary or forced, through want of food or refreshment; this was verified in Christ, when he kneeled and prayed, and his sweat was as it were great drops of blood falling to the ground; see (Psalms 69:10) .

And my flesh fails of fatness ;
or "for want of oil" ^F11 ; the radical moisture of his flesh being dried up like a potsherd, (Psalms 22:15) .

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FOOTNOTES:

• F11: (Nmvm) (di' elaion) , Sept. "propter oleum", V. L. "propter defectum olei", Eth. Arab.