The Messenger believed with what has been sent down to him from his Lord, and so do the believers, everyone believed with Lord Allah, His Angels, His Books, and His Messengers. We don’t differentiate between anyone among His Messengers. And they say: “We heard and we obeyed; Our Lord, You forgive us, and unto You is our returning”.
It is told in verse 4: 136: “Oh you who believed! You believe with Lord Allah and with His Messenger, and the Book which We have revealed upon His Messenger, and the Book which is revealed previously; and whoever hides Allah, His Angels, His Books, His Messengers and the Day of Judgment, then surely he has gone astray”. The Truth and Proof Adhikr are sent down to all three hundred and thirteen Messengers to teach that there is no deity except Lord, so all should serve him alone as explained in verses 21: 24-25. Adhikr revealed to Messenger Muhammad contains all three hundred and twelve previous Books and their upright Explanations as told in verses 16: 44 and 98: 2-3.
But by rejecting the Manifest Reading Adhikr, the Arabic Quran reading Fujjar are learning and teaching Fujjar Books written by the twenty-nine pseudo-prophets and hypocrites. That is why they are denoted as the worst creatures who don’t utilize their intelligence as explained in verse 8: 22. These Fujjar who accept Antichrist as a prophet first, and later as the lord will be killed by the other people belonging to the Messenger's community after the second coming of Jesus as explained in verse 4: 91. At that time only they will accept that not the Arabic Quran, but Adhikr was the Lord’s Book as told in verse 38: 8. See explanation 2: 136; 5: 48, and 55-56.