This Bible contradiction is from the Skeptic's Annotated Bible.
On a mountain top in Galilee.
Matthew 28:16 View context
Then the eleven disciples went away into Galilee, into a mountain where Jesus had appointed them.
In a room in Jerusalem.
Mark 16:14 View context
Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
Luke 24:33-37 View context
And they rose up the same hour, and returned to Jerusalem, and found the eleven gathered together, and them that were with them,
Saying, The Lord is risen indeed, and hath appeared to Simon.
And they told what things [were done] in the way, and how he was known of them in breaking of bread.
And as they thus spake, Jesus himself stood in the midst of them, and saith unto them, Peace [be] unto you.
But they were terrified and affrighted, and supposed that they had seen a spirit.
John 20:19 View context
Then the same day at evening, being the first [day] of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace [be] unto you.