Mark 1:2

As it is written in Isaiah the prophet: “Behold, I will send My messenger ahead of You, who will prepare Your way.”

Note BYZ and TR in the prophets:

Note Malachi 3:1

As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee.

As it is written in the prophets, “Behold, I send my messenger before your face, who will prepare your way before you:

Note “Behold”, from “ἰδοὺ”, means look at, take notice, observe, see, or gaze at. It is often used as an interjection.

Even as it is written in Isaiah the prophet, Behold, I send my messenger before thy face, Who shall prepare thy way;