Cross reference
Ezekiel 4:13
13 And Jehovah said, Even thus shall the children of Israel eat their bread unclean, among the nations whither I will drive them.
Daniel 1:8
8 But Daniel purposed in his heart that he would not defile himself with the king's dainties, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself.
Hosea 9:3-4
3 They shall not dwell in Jehovah's land; but Ephraim shall return to Egypt, and they shall eat unclean food in Assyria.
4 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.