Greek Expositor (anonymous) — as excerpted in the Catena Aurea on Luke 1:18-22

“(Antipater Bostrensis.) Now while these things were going on within, the delay excited surprise among the multitudes who were waiting without, as it follows: And the people waited for Zacharias, and marvelled that he tarried. And while various suspicions were going about, each man repeating them as it pleased him, Zacharias coming forth told by his silence what he secretly endured. Hence it follows, And when he came out, he could not speak.”