Augustine of Hippo — as excerpted in the Catena Aurea on Mark 1:35-39

“(de Cons. Evan. ii. 19) But by this preaching, which, he says, He continued in all Galilee, is also meant the sermon of the Lord delivered on the mount, which Matthew mentions, and Mark has entirely passed over, without giving any thing like it, save that he has repeated some sentences not in continuous order, but in scattered places, spoken by the Lord at other times.”