Contradiction with Acts 1:8
While Acts 10:39 mentions the specific role of the witnesses, Acts 1:8 emphasizes the empowering role of the Holy Spirit for witnesses, not their mere eyewitness account of events.
Acts 1:8: But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth. [power...: or, the power of the Holy Ghost coming upon you]
Contradiction with Matthew 26:56
Acts 10:39 states that they were witnesses of all things Jesus did, while Matthew 26:56 indicates that all the disciples forsook Him and fled during the arrest of Jesus.
Matthew 26:56: And they that had laid hold on Jesus led [him] away to Caiaphas the high priest, where the scribes and the elders were assembled.
Contradiction with Mark 14:50
Contrary to Acts 10:39 where witnesses are present, Mark 14:50 states that during Jesus' arrest, all His followers forsook Him, leading to a temporary lack of witnesses.
Mark 14:50: And they all forsook him, and fled.
Contradiction with John 14:9
Acts 10:39 talks about witnessing acts Jesus did, John 14:9 emphasizes knowing Jesus rather than merely witnessing His acts.
John 14:9: Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou [then], Shew us the Father?