John Gill Bible Commentary

And a third part shall be at the gate of Sur,.... Generally thought by the Jews to be the eastern gate, so called, as they say, because such as were defiled were bid to depart, or go back, as this word signifies, and not enter the temple; it is called "the gate of the foundation", Ch2 23:5 because, according to Ben Gersom, here the foundation of the sanctuary was first laid; it is said (b) to have five other names besides these: and a third part at the gate behind the guard; the temple guard, which had a captain of them, Act 4:1 this gate is supposed to be the same with "sippim", or the threshold gate, Ch2 23:4 and to be the southern one: so shall ye keep the watch of the house, that it be not broken down; guard the temple, that none break or rush into it, of Athaliah's party. (b) T. Hieros. Yoma apud Beckium in Targ. in 2 Chron. xxiii. 5.