Mark 6:14 later reveals Herod's superstitious fear that John was raised — the execution directly causes this reaction.

Matthew 14:10 gives the parallel account of John's beheading, confirming the same event from another gospel.

Matthew 14:11 continues the narrative, showing the head presented on a platter — same outcome from a different perspective.

Proverbs 16:14 states that a king's wrath is a messenger of death — exactly what Herod's anger/obligation produces here.

Revelation 20:4 mentions those beheaded for their witness — John is a prototype of Christian martyrs suffering the same fate.