Neither will I make the feet of Israel move ... out of the land which I gave their fathers - alluding to the promise (2Sa 7:10).
only if they will observe, etc. - This condition was expressed from the first plantation of Israel in Canaan. But that people not only did not keep it, but through the pernicious influence of Manasseh, were seduced into greater excesses of idolatrous corruption than even the original Canaanites.