Have they feet wherewith they walk: an interrogative meant as a denial, in other words, do they have feet by which they do not walk, nay it is by God [that they walk or not], since it is He who makes them walk with them, as is the case with all of their other limbs. Say: 'Call upon your associates, from among the jinn or mankind, then scheme against me, if you can, for the One who is in charge of my affair, my Preserver and the One governing me is: