In John 1:8, the narrator states John was not the light — reinforcing the same point John himself makes here: he is not the Messiah.

In John 3:28-36, John the Baptist repeats his denial ('I am not the Christ') and expands on his role as forerunner, directly recalling his earlier confession.

In Luke 3:15-17, the people wonder if John is the Christ, and he denies it, then proclaims the coming one — a direct parallel to the scene here.

In Acts 13:25, Paul quotes John the Baptist's denial and his statement about untying sandals — confirming the testimony recorded here.

In Matthew 3:11, John the Baptist declares the coming one is mightier — complementing his denial here by identifying who the Christ is.

In Mark 1:7, John the Baptist humbly points to Jesus as mightier — directly following his denial of being the Christ in the parallel account.