Midrash Tanchuma Buber
(Ps. 48:3 [2]:) BEAUTEOUS LANDSCAPE (NWP)…. R. Levi said: <Jerusalem> is beautiful (N'P) in itself, because it sifts (rt.: NPH) the peoples of the world.38Cf.: PR 41:2. Thus it is stated (in Is. 30:28): TO SIFT (HNPH) THE NATIONS WITH THE SIEVE (rt.: NPH) OF DESTRUCTION, AND A MISLEADING BRIDLE SHALL BE IN THE JAWS OF THE PEOPLES.