Why were there multiple Messengers?
Since the inception of time, Allah has dispatched Messengers and Prophets to guide humanity towards monotheism, urging them to worship their Lord and conveying His commandments and prohibitions. The central theme of all Prophets and Messengers' messages has been the call to worship Allah Almighty exclusively. When a community deviates or rejects the monotheistic message brought by their Messenger, Allah sends another Messenger to rectify their course and lead them back to the pure and natural belief of worshipping Allah alone and obedience to Him. This pattern persisted until the sending of the final Messenger, Prophet Muhammad (peace be upon him). He brought forth the eternal and universal religion for all of humanity, destined to endure until the Day of Resurrection. This religion complements and supersedes all the preceding laws, with the Almighty decreeing that this message shall remain preserved until the end of time.
Therefore, Muslims believe, as Allah commanded, in all the previous Messengers and Scriptures.
To emphasize this, Allah Almighty says,
﴿ءَامَنَ ٱلرَّسُولُ بِمَاۤ أُنزِلَ إِلَیۡهِ مِن رَّبِّهِۦ وَٱلۡمُؤۡمِنُونَۚ كُلٌّ ءَامَنَ بِٱللَّهِ وَمَلَـٰۤىِٕكَتِهِۦ وَكُتُبِهِۦ وَرُسُلِهِۦ لَا نُفَرِّقُ بَیۡنَ أَحَدࣲ مِّن رُّسُلِهِۦۚ وَقَالُوا۟ سَمِعۡنَا وَأَطَعۡنَاۖ غُفۡرَانَكَ رَبَّنَا وَإِلَیۡكَ ٱلۡمَصِیرُ﴾"The Messenger believes in what has been sent down to him from his Lord, as do the believers. All of them believe in Allah, His angels, His Books, and His messengers, [saying], "We make no distinction between any of His messengers." And they say, "We hear and obey. Grant us Your forgiveness, our Lord, and to You is the [final] destination.
"[2: 285]
