נחמיה יב:כה פירוש: רש״י

sentries of the gates [in their] watch The sentries of the gates were in their watch to guard the gates of the Temple.

at the thresholds Heb. בַּאֲסֻפֵּי, like בְּסִיפֵּי הַשְּׁעָרִים, at the thresholds of the gates.