וְֽעַד־הֵ֔נָּה בְּשַׁ֥עַר הַמֶּ֖לֶךְ מִזְרָ֑חָה הֵ֚מָּה הַשֹּׁ֣עֲרִ֔ים לְמַחֲנ֖וֹת בְּנֵ֥י לֵוִֽי׃
Rashi on I Chronicles
And from here until the king’s gate to the east The meaning of עַד is: from here until a gate named the King’s Gate to the east.
Rashi on I Chronicles
they are the gate sentries Shallum and his brethren of the camps of the sons of Levi.