Following are a number of back-translations of Mark 1:2:

• Uma: “The story begins from the arrival of Yohanes the Baptizer. The arrival of Yohanes was already foretold in the letter of the prophet Yesaya. With the lips of the prophet(s), God said to his Child like this: ‘This one is my messenger, I send him ahead of you (sing.), in order to prepare your (sing.) road.'” (Source: Uma Back Translation)
• Yakan: “The beginning of this good news was written by Nabi Isaya in the holy-book. He said, ‘God says, ‘I will send my messenger ahead of you so-that/and he will prepare your way.'” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “Isaiah, the former prophet of God long ago, wrote what God said to his Son, and that was the beginning of the good news about Jesus Christ, Son of God. God said, ‘There will be in the future a person whom I will cause to go ahead of you, and I will cause to announce that you will soon arrive.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “There is that which God said to his Child long-ago that he caused-Isaias -to-write who was a prophet. He said, ‘You (sing.) listen, I will send someone to precede you (sing.) to prepare where-you-(sing.)-will-walk.” (Source: Kankanaey Back Translation)
• Tagbanwa: “This began when what had been written by the prophets of the past was fulfilled, which said, ‘It’s true, there is one whom I will send who will go ahead of you (sing.), for he will prepare where you will go.'” (Source: Tagbanwa Back Translation)
• Shipibo-Conibo: “Thus it is written in the book of Isaiah, a teller of God’s word. Look! The taker of my word I send before you, to arrange your path before you.” (Source: James Lauriault in The Bible Translator 1951, p. 32ff. )
• Balinese: “It says in the book of the prophet Jesaja, as follows: Father sends a messenger in front of you. my child who shall put aright your way;” (Source: J.L. Swellengrebel in The Bible Translator 1950, p. 75ff. )
• English translation by Michael Pakaluk (2019): “Exactly as is written in Isaiah the prophet (Behold, I am sending my messenger before you, who will prepare your way… .”

For the Old Testament quote, see Malachi 3:1.