The Sifra read the words "the land of Canaan" in to refer to the Land that God set aside distinctly for the Israelites. The Sifra thus read the words "which I give to you" in to exclude the lands of Ammon and Moab east of the Jordan River. Thus house plagues could occur only in the Land of Israel west of the Jordan. And Rabbi Ishmael read the words "of your possession" in to exclude the possession of Gentiles in the Land of Israel from house plagues.