שְׂא֤וּ שְׁעָרִ֨ים ׀ רָֽאשֵׁיכֶ֗ם וּ֭שְׂאוּ פִּתְחֵ֣י עוֹלָ֑ם וְ֝יָבֹא מֶ֣לֶךְ הַכָּבֽוֹד׃
Lift up your heads, O ye gates, Yea, lift them up, ye everlasting doors; That the King of glory may come in.
Read kabbalistic (mystical) interpretation of Psalms 24:9: and classical mystical sources.