Following are a number of back-translations of Luke 3:4:

• Noongar: “The prophet Isaiah wrote these words on paper: ‘One man is calling out in the desert, ‘Prepare the Lord’s path! Make a straight path for his journey!” (Source: Warda-Kwabba Luke-Ang)
• Uma: “Yohanes fulfilled what was written in the letter of the prophet Yesaya long ago, its sound like this: ‘There is a person who cries/shouts in the desert, he says: ‘The Lord is almost arriving! Prepare ahead of time for him his road! Make flat ahead of time the road that he will pass on!” (Source: Uma Back Translation)
• Yakan: “This doing of Yahiya was beforehand foretold in the writing of the prophet Isaya of old. It says there: ‘There is a person calling in the lonely place. This is what he says: ‘Soon the Lord will arrive. Smooth out the way that he will pass-by on. Straighten out the way that he will follow.” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “Now this teaching of John was a fulfillment of a prophecy long ago by Isaiah, the prophet of God, because Isaiah said, ‘There is a person in the land where no people live; and the people who come out to him will hear him say, ‘The Lord will soon come; you (pl.) clean the way He will pass. Straighten out the trail that he will follow, which is to say, you (pl.) prepare for His coming.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “That-aforementioned that Juan was doing, it was the fulfillment of what Isaias the prophet wrote saying, ‘In the place with no inhabitants there is someone shouting (appropriate to preaching without a loudspeaker) saying, ‘Prepare the path-to-be-taken by the Lord who is coming so that the path he will walk-on will be good.” (Source: Kankanaey Back Translation)
• Tagbanwa: “This Juan is who was referred to by what was written by the prophet Isaias, which said, ‘There is one voicing there in the wilderness place saying, ‘Make a trail for the Lord. Make-direct and improve/make-good this which he will walk on.” (Source: Tagbanwa Back Translation)

For the Old Testament quote, see Isaiah 40:3 – Isaiah 40:5.