This Bible contradiction is from the Skeptic's Annotated Bible.
Verses
Thou shalt love thy neighbor as thyself.
Matthew 19:17-19 View context
And he said unto him, Why callest thou me good? [there is] none good but one, [that is], God: but if thou wilt enter into life, keep the commandments.
He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,
Honour thy father and [thy] mother: and, Thou shalt love thy neighbour as thyself.
Defraud not.
Mark 10:19 View context
Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
There was no sixth. Jesus listed only five commandments.
Luke 18:20 View context
Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Honour thy father and thy mother.