In those days, and in that time, saith the LORD, the children of Israel shall come, they and the children of Judah together, going and weeping: they shall go, and seek the LORD their God.
In those days ... the children of Israel shall come, they and the children of Judah together, going and weeping. Fulfilled only in part when some few of the ten tribes of "Israel" joined Judah in a "covenant" with God, at the restoration of Judah to its land (Nehemiah 9:38; Nehemiah 10:29). The full event is yet to come (Jeremiah 31:9; Hos God, at the restoration of Judah to its land (Nehemiah 9:38; Nehemiah 10:29). The full event is yet to come (Jeremiah 31:9; Hosea 1:11; Zechariah 12:10).
Weeping - with joy at their restoration, beyond all hope; and with sorrow at the remembrance of their sins and sufferings. An earnest of this future weeping was given at the restoration from Babylon, when "the people could not discern the noise of the shout of joy from the noise of the weeping of the people;" for "the fathers ... ancient men that had seen the first temple, when the foundation of this house was laid before their eyes, wept with a loud voice," while "many shouted aloud for joy" (Ezra 3:12-13; Psalms 126:5-6).
And seek the Lord - (Hosea 3:5, "Afterward shall the children of Israel return and seek the Lord their God, and David their king, and shall fear the Lord and His goodness in the latter days").