Luke 3:18
And many other things in his exhortation preached he unto the people.
Cross-reference
John 1:29
Parallel
In John 1:29, John the Baptist specifically identifies Jesus as the Lamb of God — the core of the good news he preached in Luke 3:18.
John 1:34
Parallel
In John 1:34, John testifies Jesus is the Son of God — a key part of the exhortations summarized in Luke 3:18.
John 3:29–36
Parallel
In John 3:29-36, John the Baptist gives his final testimony about Jesus' supremacy — consistent with the 'many other exhortations' in Luke 3:18.
John 1:15
Parallel
John 1:15 records John's testimony about Jesus — parallel to the summary here that John preached good news and exhorted.