וְהַשְּׁלִשִׁית֙ בְּשַׁ֣עַר ס֔וּר וְהַשְּׁלִשִׁ֥ית בַּשַּׁ֖עַר אַחַ֣ר הָרָצִ֑ים וּשְׁמַרְתֶּ֛ם אֶת־מִשְׁמֶ֥רֶת הַבַּ֖יִת מַסָּֽח׃
now another third part was at the gate Sur, and another third part at the gate behind the guard—shall keep the watch of the house, and be a barrier.
Read kabbalistic (mystical) interpretation of II Kings 11:6: and classical mystical sources.