Then shall: This seems to refer to the future conversion and restoration of the Jews and Israelites, under on head, Jesus Christ; so that there shall be one flock and one shepherd.
the children of Judah: Hosea 3:5, Isaiah 11:12-13; Jeremiah 3:18-19, Jeremiah 23:5-8, Jeremiah 30:3, Jeremiah 31:1-9, Jeremiah 33:15-26; Jeremiah 50:4-5, Jeremiah 50:19; Ezekiel 16:60-63, Ezekiel 34:23-24, Ezekiel 37:16-25; Micah 2:12-13; Zechariah 10:6-9; Romans 11:25-26
for: An allusion to the word Jezreel. God who sowed them among the nations in His wrath, shall reap and gather them in His mercy. See Hosea 2:22-23; Psalms 22:27-30, Psalms 110:3; Romans 11:15