Gregory the Great
Catena Aurea · Lukasevangelium 19
And when he was come near, he beheld the city, and wept over it, Saying, If thou hadst known, even thou, at least in this thy day, the things which belong unto thy peace! but now they are hid from thine eyes. For the days shall come upon thee, that thine enemies shall cast a trench about thee, and compass thee round, and keep thee in on every side, And shall lay thee even with the ground, and thy children within thee; and they shall not leave in thee one stone upon another; because thou knewest not the time of thy visitation.
This too which is added, namely, They shall not leave in thee one stone upon another, is now witnessed in the altered situation of the same city, which is now built in that place where Christ was crucified without the gate, whereas the former Jerusalem, as it is called, was rooted up from the very foundation. And the crime for which this punishment of overthrow was inflicted is added, Because thou knewest not the time of thy visitation.