Contradiction with Matthew 11:11
Contradicts the notion of John the Baptist's humility by stating he is the greatest born of women.
Matthew 11:11: Verily I say unto you, Among them that are born of women there hath not risen a greater than John the Baptist: notwithstanding he that is least in the kingdom of heaven is greater than he.
Contradiction with John 1:21
Contradicts Acts 13:25 where John denies being the Christ but confirms he is not Elijah, which causes confusion about his identity.
John 1:21: And they asked him, What then? Art thou Elias? And he saith, I am not. Art thou that prophet? And he answered, No. [that prophet: or, a prophet?]
Contradiction with Luke 7:19-20
Contradicts by showing John's uncertainty about Jesus being the one to come, while Acts 13:25 implies John is clear about Jesus' identity.
Luke 7:19-20: And John calling [unto him] two of his disciples sent [them] to Jesus, saying, Art thou he that should come? or look we for another?
Contradiction with Mark 1:7-8
Contradicts the idea of John's certainty in identifying the one coming after him by emphasizing John's lack of knowledge about Jesus.
Mark 1:7-8: And preached, saying, There cometh one mightier than I after me, the latchet of whose shoes I am not worthy to stoop down and unloose.