Charles Ellicott Commentary Hosea 9:3-4

"They shall not dwell in Jehovah`s land; but Ephraim shall return to Egypt, and they shall eat unclean food in Assyria. They shall not pour out wine-offerings to Jehovah, neither shall they be pleasing unto him: their sacrifices shall be unto them as the bread of mourners; all that eat thereof shall be polluted; for their bread shall be for their appetite; it shall not come into the house of Jehovah." — Hosea 9:3-4 (ASV)

Canaan, the land of Jehovah, is holy, Assyria unholy (Amos 7:17), where there was no temple or sacred ordinances. Since meat was not a divinely sanctioned food, except in connection with a Jehovah festival, it became in the land of exile unclean. This became true in the eyes of Hosea of all eating. “In the family every feast was a Eucharistic sacrifice” (W. R. Smith, Old Testament in the Jewish Church, pp. 235 and 237). (Compare to Ezekiel 4:13.)