And I will scatter you among the heathen, and will draw out a sword after you: and your land shall be desolate, and your cities waste (Leviticus 26:33).How extraordinary! God tells us about Israel's dispersion even before it became a nation.
And the LORD shall scatter thee among all people, from the one end of the earth even unto the other; and there thou shalt serve other gods, which neither thou nor thy fathers have known, even wood and stone (Deuteronomy 28:64).
After Israel became a nation, Ezekiel wrote:
And they shall know that I am the Lord, when I shall scatter them among the nations and disperse them in the countries (Ezekiel 12:15).God kept His word and the Jews went into dispersion twice. The last dispersion was in 70 AD by the Romans.
And I will scatter thee among the heathen, and disperse thee in the countries, and will consume thy filthiness out of thee (Ezekiel 22:15).
The Jews never forgot Jerusalem while they were in Babylon
during their first dispersion. They sang the words of the following
By the rivers of Babylon, there we sat down, yea, we wept, when we remembered Zion. We hanged our harps upon the willows in the midst thereof. For there they that carried us away captive required of us a song; and they that wasted us required of us mirth, saying, "Sing us one of the songs of Zion." How shall we sing the LORD's song in a strange land? If I forget thee, O Jerusalem, let my right hand forget her cunning. If I do not remember thee, let my tongue cling to the roof of my mouth; if I prefer not Jerusalem above my chief joy (Psalm 137:1-6).After their second dispersion by the Romans, until they returned to their land in 1948, they were always confident that one day they would return to their land. Every year at the celebration of Passover, they greeted each other with the words, "Next year in Jerusalem."
The Jews never forgot Jerusalem, it was always dear to their hearts.