Deuteronomy 30:4
If any of thine be driven out unto the outmost parts of heaven, from thence will the LORD thy God gather thee, and from thence will he fetch thee: If any of thine be driven out unto the outmost parts of heaven, from thence will the LORD thy God gather thee, and from thence will he fetch thee:
The verse looks forward to Israel settled in Canaan with each tribe in its own possession, and after that settlement to a long history of apostasy and its punishment. It foretells dispersion among the heathen because of their sins, with the glory departed, the beautiful city in ruins and the people as captives in strange lands, Jerusalem permitted to be destroyed by fire and the people overcome by enemies and carried into heathen lands. The scattering came because they had failed to be missionaries and had built walls of division between themselves and the people round about them, so the Lord scattered them that the knowledge of the truth might be carried to the world.
The verse promises that God will gather His people even from the farthest places of their scattering, from the outmost places to which they have been driven, and bring them again into their own land, the land of their fathers. That gathering is conditional on returning to God in penitence and faith and keeping His commandments, on being loyal and true and submissive, and then He will restore them and again show them favor. God's faithfulness in carrying out the scattering makes His faithfulness to gather certain, and the promise remains unchanged across the centuries. After the restoration to the land, the outlook extends at last to subjection under the dominion of Rome.