What is the biblical source for 'voice in a wilderness'?

Answer 1

Isaiah 40:3 - The voice of him that crieth in the wilderness, Prepare ye the way of the LORD, make straight in the desert a highway for our God. Matthew 3:3 - For this is he that was spoken of by the prophet Esaias, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. Mar 1:3 - The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. Luk 3:4 - As it is written in the book of the words of Esaias the prophet, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. John 1:23 - He said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the prophet Esaias.

Answer 2

Matthew 3:1-3 - In those days John the Baptistcame preaching in the wilderness of Judea, and saying, "Repent, for the kingdom of heaven is at hand!" For this is he who was spoken of by the prophet Isaiah, saying: "The voice of one crying in the wilderness: 'Prepare the way of the Lord; Make His paths straight.' " [NKJV]