And those who believed with Lord Allah and with His Messengers, and who don’t make any difference between them, for such We will give their rewards, and Lord Allah is the Oft-Forgiving, the Merciful.
The true believer is the one who believes with Lord as submitted by the 6236 verses of Lord’s Speech and believes that only Adhikr is revealed upon 313 Messengers from Nooh to Muhammad. The last form of Lord’s Message revealed to the last Messenger Muhammad is codified as a Book named Adhikr which testifies and safeguards all previous 312 Books and their upright Explanations as told in verses 5: 48; 16: 44 and 21: 24.
So whoever holdfasts Adhikr, he did holdfast Lord and is guided in the Straightpath as explained in verses 2: 256; 3: 101-102 and 4: 174-175. See explanation 2: 136, 285; 3: 133-136 and 4: 136.