It is in the Holy Bible. Muhammad or Joseph Smith is not mentioned in the Holy Bible.Ah, but there are many other verses which you seem to ignore.
And how do you know it is Jesus saying this? This is some unknown person who claims the Apostle John heard Jesus say this. So third hand. Maybe he did, maybe he didn’t. But there are many parts of the Gospel of John that are inconsistent with the other Gospels.
Why do you ignore what God told Mohammed? Or Joseph Smith?