1 Kings 11:11

11 So the Lord said to Solomon, since this is your attitude, and you have not kept my covenant and my decrees, which I commanded you, I will most certainly tear the kingdom away from you and give it to your servant.

As we read earlier God split the kingdom in two, and caused most of the children of Israel to go into captivity, losing their identity until the end of the age. 

Isaiah 1:3-9

3 The ox knows his owner, and the ass his master's crib: but Israel does not know, my people do not consider.
4 Ah sinful nation, a people laden with iniquity, a seed of evildoers, children that are corrupters: they have forsaken the LORD, they have provoked the Holy One of Israel to anger, they are gone away backward.
5 Why should you be stricken any more? you will revolt more and more: the whole head is sick, and the whole heart faint.
6 From the sole of the foot even to the head there is no soundness in it; but wounds, and bruises, and putrifying sores: they have not been closed, neither bound up, neither mollified with ointment.
7 Your country is desolate, your cities are burned with fire: your land, strangers devour it in your presence, and it is desolate, as overthrown by strangers.

Israel was taken into captivity, and another people (later known as the Samaritans) were brought in by the Assyrians as replacements. The smaller kingdom in the south, however, retained its identity and salvation from God.

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