In John 1:27, John declares he is unworthy to untie Christ's sandals — consistent with his role as the one sent before him in John 3:28.

In John 1:25, the Pharisees question John's baptism based on his identity — the context that led to his denial which he references in John 3:28.

In John 1:23, John identifies himself as the voice preparing the way — the same forerunner role he affirms in John 3:28 as being sent before Christ.

In John 1:20, John the Baptist explicitly denies being the Christ — the very statement he recalls in John 3:28 as his earlier confession.

John 1:8 states John was not the light but a witness, mirroring his denial of being the Christ in John 3:28.

John 1:6 introduces John as a man sent from God; John 3:28 echoes that mission by stating he was sent before Christ.

Malachi 4:5 predicts Elijah sent before the great day; John is identified as that Elijah figure preparing for Christ.

Luke 3:4-6 applies Isaiah's prophecy of a voice preparing the way to John, reinforcing his claim of being sent before the Christ.

Luke 1:76 prophesies John's role as forerunner, exactly what John claims here: he is not the Christ but sent before Him.

Luke 1:17 describes John going before in the spirit of Elijah, fulfilling the prophetic role of preparing the way for the Lord.

Mark 1:3 quotes Isaiah about preparing the way, tying John's role as the forerunner to Old Testament prophecy.

Mark 1:2 quotes Malachi 3:1 about the messenger sent before, directly linking John's statement to that prophecy.

Matthew 3:11 contrasts John's water baptism with Christ's Spirit baptism, expanding on John's claim of being sent before a mightier one.

Matthew 3:3 applies Isaiah's 'voice crying in the wilderness' to John, confirming his preparatory role as the one sent before.

Malachi 3:1 prophesies a messenger preparing the way for the Lord, which John here claims to be fulfilling.

Luke 3:15 shows people questioning if John is the Christ, directly motivating his denial in John 3:28.

Mark 1:7 records John's own words: he is unworthy compared to the coming one, the same self-deprecating role stated in John 3:28.

Acts 19:4 summarizes John's message: he pointed to the coming one, Jesus, exactly the role John claims in John 3:28.

Luke 1:16 prophesies John turning many to God, aligning with his claim of being sent before Christ to prepare people.