isaiah 5:17 Then shall the lambs feed after their manner, and the waste places of the fat ones shall strangers eat. - Free Bible Online

      17. after their manner--literally, "according to their own word," that is, at will. Otherwise, as in their own pasture [GESENIUS]: so the Hebrew in Mic 2:12. The lands of the Scenite tent dwellers (Jer 35:7). Arab shepherds in the neighborhood shall roam at large, the whole of Judea being so desolate as to become a vast pasturage.
      waste . . . fat ones--the deserted lands of the rich ("fat," Ps 22:29), then gone into captivity; "strangers," that is, nomad tribes shall make their flocks to feed on [MAURER]. Figuratively, "the lambs" are the pious, "the fat ones" the impious. So tender disciples of Jesus Christ (Joh 21:15) are called "lambs"; being meek, harmless, poor, and persecuted. Compare Eze 39:18, where the fatlings are the rich and great (1Co 1:26, 27). The "strangers" are in this view the "other sheep not of the" the Jewish "fold" (Joh 10:16), the Gentiles whom Jesus Christ shall "bring" to be partakers of the rich privileges (Ro 11:17) which the Jews ("fat ones," Eze 34. 16) fell from. Thus "after their (own) manner" will express that the ChristianChurch should worship God in freedom, released from legal bondage (Joh 4:23; Ga 5:1).

JFB.