فهبكso suppose you طعامكyour food استوثقتyou made certain منهof it
فهبك طعامك استوثقت منه
فماthen what بالis the matter with الكنيفthe privy عليهon it قفلa lock
فما بال الكنيف عليه قفل
So, suppose you have secured your food—
why, then, is there a lock on the privy?