What bible said about Muhammad
1 John 4:1New King James Version (NKJV)
4 Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world.
Allah will make better Qur’an next week?

We do not abrogate a verse or cause it to be forgotten except that We bring forth [one] better than it or similar to it. Do you not know that Allah is over all things competent?
But Allah said he will never change his Qur’an ?

And perfected is the Word of your Lord in sincerity and justice; nothing whatever can exchange His Words; and He is the Ever-Hearer, The Ever-Knowing.
But wait Allah will change the Qur’an ?

And when We substitute a verse in place of a verse – and Allah is most knowing of what He sends down – they say, “You, [O Muhammad], are but an inventor [of lies].” But most of them do not know.

He has been sending down upon you the Book with the Truth, sincerely (verifying) what was before it (Literally: between its two hands), and He sent down the Tawrah (The Book revealed to Musa “Moses”) and the Injil. (The Book revealed to Isa).