פירוש על עבודה זרה 39:8

Meir argues that the verse is phrased in that way to suggest that it is preferable to give the food to the stranger rather than sell it to a non-Jew. But R. Judah says that we do not need a verse to do this—since Jews are commanded to maintain strangers, it is obvious that it would be preferable to give the food to the stranger.