Rashi on Leviticus 21:17/רש"י על ויקרא כ״א:י״ז

1לחם אלהיו THE BREAD OF HIS GOD — This means, any food of his God (not “bread” only); any meal is termed לחם, as e. g., (Daniel 5:1) “he made a great banquet (לְחַם)” (cf. Rashi on Genesis 31:54).