King James Version (KJV)
And a third part {shall be} at the gate of Sur; and a third part at the gate behind the guard: so shall ye keep the watch of the house, that it be not broken down. {that...: or, from breaking up}
Modern English
a third of you shall be at the gate Sur; and a third of you at the gate behind the guard. So you shall keep the watch of the house, and be a barrier.
Hebrew
וְהַשְּׁלִשִׁית֙ בְּשַׁ֣עַר ס֔וּר וְהַשְּׁלִשִׁ֥ית בַּשַּׁ֖עַר אַחַ֣ר הָרָצִ֑ים וּשְׁמַרְתֶּ֛ם אֶת־מִשְׁמֶ֥רֶת הַבַּ֖יִת מַסָּֽח׃
vhashlishiyt bshaʿar svr vhashlishiyt bashaʿar ʾaḥar haraṣiym vshmartem ʾet-mishmeret habayit masaḥ