There is a symbiotic relationship between God, the land of Israel and the Jewish people. The people were to live and prosper in the land. Being outside of the land was being outside of the blessings of God. The Bible considers being outside the land as being in captivity.
Not all the Jews returned from Babylon. But those that did separated themselves from the filth of the nations.
And the descendants of the captivity kept the Passover on the fourteenth day of the first month. For the priests and the Levites had purified themselves; all of them were ritually clean. And they slaughtered the Passover lambs for all the descendants of the captivity, for their brethren the priests, and for themselves. Then the children of Israel who had returned from the captivity ate together with all who had separated themselves from the filth of the nations of the land in order to seek the Lord God of Israel. And they kept the Feast of Unleavened Bread seven days with joy; for the Lord made them joyful, and turned the heart of the king of Assyria toward them, to strengthen their hands in the work of the house of God, the God of Israel.
PRAY FOR ALL THE JEWISH PEOPLE THAT THEY WILL RETURN TO ISRAEL, THE LAND OF THEIR BLESSING.