כִּֽי־עַמְּךָ֥ וְנַחֲלָתְךָ֖ הֵ֑ם אֲשֶׁ֤ר הוֹצֵ֙אתָ֙ מִמִּצְרַ֔יִם מִתּ֖וֹךְ כּ֥וּר הַבַּרְזֶֽל׃
for they are Thy people, and Thine inheritance, which Thou broughtest forth out of Egypt, from the midst of the furnace of iron;
Read kabbalistic (mystical) interpretation of I Kings 8:51: and classical mystical sources.