Of the myriad passages in the Bible that speak to the unique and full deity of Jesus, one is the passage used by John the Baptist.
In Luke 3:4, and also in Matthew 3:3, John appears in the region near the Jordan river, preaching and baptizing. Luke speaks of John as the one who is “The voice of one crying in the wilderness, prepare the way of the LORD.” This is a quote from Isaiah 40:3, which includes the part Luke quotes, but also goes on to say, “Make straight in the desert a highway for our God.”
The use of LORD with all capital letters (in some English versions) reflects the Old Testament use of the name for God, sometimes called the tetragrammaton (transliterated YHWH). So while the New Testament Greek uses the more general “Lord,” the Old Testament makes it crystal clear that John the Baptist was preparing the way for YHWH, and mentions the term “God” in the original passage.
John was therefore preparing the way for God to appear to His people, and the gospel writers make this clear. These passages make it clear that Jesus is the one and only God, and the unique deity of Christ is confirmed in these verses.