וַיָּשִׂ֥ימוּ ל֛וֹ לְבַדּ֖וֹ וְלָהֶ֣ם לְבַדָּ֑ם וְלַמִּצְרִ֞ים הָאֹכְלִ֤ים אִתּוֹ֙ לְבַדָּ֔ם כִּי֩ לֹ֨א יוּכְל֜וּן הַמִּצְרִ֗ים לֶאֱכֹ֤ל אֶת־הָֽעִבְרִים֙ לֶ֔חֶם כִּי־תוֹעֵבָ֥ה הִ֖וא לְמִצְרָֽיִם׃
And they set on for him by himself, and for them by themselves, and for the Egyptians, that did eat with him, by themselves; because the Egyptians might not eat bread with the Hebrews; for that is an abomination unto the Egyptians.
Read kabbalistic (mystical) interpretation of Genesis 43:32: and classical mystical sources.