For you will spread out to the right and left; your descendants will dispossess the nations and inhabit the desolate cities.
If we apply this to the state of the Jews after their return out of captivity, it is a prophecy of the increase of their nation after they were settled in their own land. Jerusalem had been in the condition of a wife written childless, or a desolate solitary widow; but now it is promised that the city should be replenished and the country peopled...
Commenting on Isaiah 54:1-5
For thou shall break forth on the right hand and on the left,.... To the south, and to the north, as the Targum, like an inundation of water, that breaks through and overflows the banks of the river, and spreads itself in the adjacent countries; or like a warehouse overstocked with goods, bursts the walls in which they are pent up; or rather as infants...
break forth--rather, "burst forth" with increase; thy offspring shall grow, answering to "thy seed" in the parallel clause. thy seed--Israel and her children, as distinguished from "the Gentiles." desolate cities--of Israel (Isa 44:26).