Jerome
Catena Aurea · Markusevangelium 1
Mk 1, Verses 2–3English original
(Mal. 3:1) As it is written in the Prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee. The voice of one crying in the wilderness, (Isa. 40:3) Prepare ye the way of the Lord, make his paths straight.
(ad Pammach. Epist. 57) But this is not written in Isaiah, but in Malachi, the last of the twelve prophets.