וְהִתְהַלַּכְתִּי֙ בְּת֣וֹכְכֶ֔ם וְהָיִ֥יתִי לָכֶ֖ם לֵֽאלֹהִ֑ים וְאַתֶּ֖ם תִּהְיוּ־לִ֥י לְעָֽם׃
And I will walk among you, and will be your God, and ye shall be My people.
Read kabbalistic (mystical) interpretation of Leviticus 26:12: and classical mystical sources.