Book of Hosea Chapter 1 Vs. 11

 Hosea's Wife and Children

Then shall the children of Judah and the children of Israel be gathered together, and appoint themselves one head, and they shall come up out of the land: for great shall be the day of Jezreel. Hos. 1:11

Then shall the... Then—when Judah and Israel will become sons of the living God, they will be completely gathered (Hos. 1:10-11).

be gathered together... The fact that both kingdoms of Israel were to be gathered proves that both were to be scattered. At this time neither kingdom had been defeated or scattered. About 72 to 90 years after this the 10 tribes were scattered (2Ki. 17:1-41), and 133 years later Judah was scattered (2 Ki. 23-25). Both were gathered after the 70 years of Judah in Babylon (that is, Judah was gathered and those of the 10 tribes who desired to return with her) and both made a nation in the land in the days of Christ. Then in A.D. 70 they were scattered again (Luke 21:20-24). Now they are both being gathered in part and will continue in national restoration as a nation until the second coming of Christ who will gather them fully from all parts of the earth (Isa. 11:10-12; Eze. 37:1-28; Mat. 24:31).

themselves one head... This predicts the reunion of all the tribes of Israel again as one nation ruled by one king (Eze. 37:1-28). One head (refers to messiah; compare 3:5).

day of Jezreel... Here used positively in the sense of divine blessing (compare 2:22).

This is looking far into the future, until the time when Jesus is the head of both. The mention of Jezreel here, is speaking of the same place we call the valley of Armageddon. This will be the time when Jesus will reign as King of kings and Lord of lords. This is also, the same thing spoken of as the two sticks that come together in Ezekiel chapter 37. The following Scriptures explain it very well.

Rom. 11:25-27 "For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in." "And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:" "For this [is] my covenant unto them, when I shall take away their sins."

At the time of national restoration the two kingdoms (Judah and… Israel), which had divided under Solomon’s son Rehoboam (1Kgs. 12:1-33), will be reunited under one Leader (cf. Eze. 37:22), the ideal Davidic Ruler of the Kingdom Age (cf. Hos. 3:5; Isa. 9:6-7; Amos 9:11; Mic. 5:2). The promise to David of an everlasting throne will be fulfilled (cf. 2Sam. 7:11-16).

The united nation also will come up out of the land. This statement may refer to a return from exile, the “land” being Egypt (cf. Hos. 2:15), which serves as a symbol of the future place(s) of captivity (cf. Hos. 8:13; 9:3, 9:6; 11:5; Deut. 28:68). However, “land” (’ereṣ) elsewhere in the Book of Hosea refers either to the land of Israel (cf. Hos. 1:2; 2:18, 2:23; 4:1, 4:3) or to the literal surface of the ground (cf. Hos. 2:21-22; 6:3) when used with the definite article and without a qualifying geographical term. The land of Egypt is specifically designated as such when mentioned in Hosea (Hos. 2:15; 7:11, 7:16; 8:13; 9:3, 9:6; 11:1, 11:5, 11:11; 12:1, 12:9, 12:13; 13:4). So it is better to understand this as a comparison between Israel and a plant which grows up from the soil. “Land” can refer to the ground (as just noted), as “come up” (‛ālâh) is used elsewhere of plant life sprouting forth from the soil (cf. “grow up,” Hos. 10:8; “growing” Deut. 29:23). The following context also supports this view. According to Hos. 2:23, the Lord promised that He would “plant” (zāra‛, the same word used in the name Jezreel) the nation in the land as one sows seed on the ground (cf. Hos. 2:22, where the name Jezreel, “God sows,” appears). Because the Lord Himself will be the One who sows, Israel will sprout forth and grow luxuriantly.

The day of Jezreel probably alludes to this time when God will plant His people in the land. If so, the literal meaning of the name Jezreel (“God sows”) takes on significance at this point. It is also likely that it alludes to Gideon’s victory over the Midianites in the Valley of Jezreel (Jdg. 7:1-25). The future day of restoration will be ushered in by a great military triumph like that of Gideon (cf. Isa. 9:4-7; see also Isa. 41:8-16; Amos 9:11-12; Joel 3:9-17). Those who oppose the Lord’s theocratic rule through the messianic King will be defeated (cf. Rev. 19:11-21). The greatness of this eschatological “day of Jezreel” will reverse the shame and defeat which Israel experienced there at the hands of the Assyrians (cf. Hos. 1:5).