Yehezkiel 37:21-22

37:21 Then tell them, ‘This is what the sovereign Lord says: Look, I am about to take the Israelites from among the nations where they have gone. I will gather them from round about and bring them to their land. 37:22 I will make them one nation in the land, on the mountains of Israel, and one king will rule over them all. They will never again be two nations and never again be divided into two kingdoms. ¹ 

Yehezkiel 37:25

37:25 They will live in the land I gave to my servant Jacob, in which your fathers lived; they will live in it – they and their children and their grandchildren forever. David my servant will be prince over them forever.

[37:22]  ¹ sn Jeremiah also attested to the reuniting of the northern and southern kingdoms (Jer 3:12, 14; 31:2-6).