כָּל־מַחְמֶ֖צֶת לֹ֣א תֹאכֵ֑לוּ בְּכֹל֙ מוֹשְׁבֹ֣תֵיכֶ֔ם תֹּאכְל֖וּ מַצּֽוֹת׃ (פ)
Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.’
Read kabbalistic (mystical) interpretation of Exodus 12:20: and classical mystical sources.