Deuteronomy 29:11 Kabbalah

לְעָבְרְךָ֗ בִּבְרִ֛ית יְהוָ֥ה אֱלֹהֶ֖יךָ וּבְאָלָת֑וֹ אֲשֶׁר֙ יְהוָ֣ה אֱלֹהֶ֔יךָ כֹּרֵ֥ת עִמְּךָ֖ הַיּֽוֹם׃

that thou shouldest enter into the covenant of the LORD thy God—and into His oath—which the LORD thy God maketh with thee this day;

Read kabbalistic (mystical) interpretation of Deuteronomy 29:11: and classical mystical sources.