Hosea 9:17

My God will cast them away, because they did not hearken unto him: and they shall be wanderers among the nations.

Ephraim in the verse stands for the apostate nation of Israel, whose people did not recognize how far they had declined spiritually nor the disastrous outcome to which their evil course was leading them. Because they refused to listen to God and obey Him, He would cast them away and reject the nation. The rejected ten tribes would thus be left homeless, to wander scattered among the other nations.