In Luke 1:77, Zechariah prophesies that John will give knowledge of salvation through forgiveness of sins — the very thing Luke 3:3 describes.

Matthew 3:5 describes the crowds coming to John, illustrating the widespread response to the baptism of repentance he proclaimed in Luke 3:3.

Matthew 3:6 describes the actual baptism and confession, directly illustrating the baptism of repentance preached in Luke 3:3.

Matthew 3:11 records John's message about the coming Messiah who will baptize with the Spirit, expanding on the repentance theme of Luke 3:3.

Mark 1:4 gives an identical summary of John's ministry — preaching a baptism of repentance for forgiveness of sins — directly paralleling Luke 3:3.

Mark 1:5 shows the people's response to John's preaching, confessing sins and being baptized, fulfilling the call in Luke 3:3.

John 1:28 specifies Bethany beyond the Jordan as the place where John baptized, adding geographical detail to the general region in Luke 3:3.

John 1:31 reveals that John's baptism aimed to reveal Jesus to Israel, complementing the repentance purpose stated in Luke 3:3.

In Acts 13:24, Paul recounts the same baptism of repentance preached by John, confirming its historical role and continuity.

In Acts 19:4, Paul explains that John's baptism of repentance was to prepare people to believe in Jesus, revealing its purpose.

Malachi 3:1 prophesies a messenger preparing the way — John's baptism of repentance fulfills this role.

Matthew 3:3 cites Isaiah to interpret John's baptism as preparing the way of the Lord, providing the prophetic foundation.

John 3:26 recalls John's earlier location and testimony, indirectly referencing the baptism of repentance from Luke 3:3.