וְלֹֽא־תָקִ֤יא הָאָ֙רֶץ֙ אֶתְכֶ֔ם בְּטַֽמַּאֲכֶ֖ם אֹתָ֑הּ כַּאֲשֶׁ֥ר קָאָ֛ה אֶת־הַגּ֖וֹי אֲשֶׁ֥ר לִפְנֵיכֶֽם׃
that the land vomit not you out also, when ye defile it, as it vomited out the nation that was before you.
Read kabbalistic (mystical) interpretation of Leviticus 18:28: and classical mystical sources.