Hosea 9:3

But Ephraim shall return to Egypt— When Salmaneser made the ten tribes captive, such as were able to escape the conqueror fled into Egypt, having implored the aid of that country against the Assyrians. It appears from the last clause, that the ten tribes, however inclined to idolatry, had before their captivity attended to the laws which prohibited the eating of unclean flesh.