וּבַקְבֻּֽקְיָ֨ה וענו [וְעֻנִּ֧י] אֲחֵיהֶ֛ם לְנֶגְדָּ֖ם לְמִשְׁמָרֽוֹת׃
Also Bakbukiah and Unni, their brethren, were over against them in wards.
Rashi on Nehemiah
in the watches as we find (in I Chronicles from ch. 24 on) that the Levites were divided into twenty- four watches.