Qur’an says in several places. Qur’an says in Surah Fatir, Ch. No. 35, Verse No. 24, ‘There is not a nation to whom we have not sent a warner or a guide’.
The Qur’an says in Surah Rad, Ch. No. 13, Verse No. 7‘And to every nation we have sent a warner’.
As far as believin in other prophets and scripts are concerned. By name the Qur’an mentions 25 prophets by name Adam, Abraham, Moses, Ismail, Jesus, Muhammad (May peace be upon them all). But according to the traditions, there are more than 124,000 prophets sent on the face of the earth. By name we know only 25. Others may be, may not be, we can not say for sure. If you read the Vedas it is mentioned in the Yajurveda, Ch. No. 3, Verse No. 32 ‘Of that God, you cannot make any image’. The Yajurveda, says in Ch. No. 33, Verse No. 3, God is formless and bodiless. The same Yajurveda, Ch. No. 40, Verse No. 8, says God has no image, has got no body. Same Yajurveda, Ch. No. 40, Verse No. 9, says that all those who worship the uncreated things, they are in darkness and it continues ‘Of that God’ ‘There is only one God, not a second one, not in the least bit’.
BIBLE:
The prophecy of coming of the unlettered Prophet (pbuh) is also mentioned in the Bible in the book of Isaiah chapter 29 verse 12.
"And the book is delivered to him that is not learned."
[Isaiah 29:12]
We believe in it. We have got no objection in accepting these portions of scriptures. They may be the word of God, Qur’an is the criteria to judge what is right, what is wrong because it is the last and final revelation. We Muslims have got no objection in accepting all these things as the word of God. But there may be other things as I said, there may be interpolation:
1. "And Jesus went . . . preaching the gospel . . . and healing every disease among the people." (Matthew 9:35)
2. "... but whosoever shall lose his fife for my sake and the gospel's, the same shall save it." (Mark 8:35)
3. "... preached the gospel. . ." (Luke 20:1)
The "gospel" is a frequently-used word, but what Gospel did Jesus preach? Of the 27 books of the New Testament, only a small fraction can be accepted as the words of Jesus. The Christians boast about the Gospels according to St. Matthew, according to St. Mark, according to St. Luke and according to St. John, but there is not a single Gospel "according" to (St.) Jesus himself! We sincerely believe that everything Christ (May the peace and blessings of God be upon him) preached was from God. That was the Injeel, the good news and the guidance of God for the Children of Israel. In his life-time Jesus never wrote a single word, nor did he instruct anyone to do so. What passes off as the "GOSPELS" today are the works of anonymous hands!
Mrs. Ellen G. White, a "prophetess" of the Seventh Day Adventist Church, in her Bible Commentary Vol. 1, page 14, has this confession to make about the fallibility of the "Holy Bible."
"THE BIBLE WE READ TODAY IS THE WORK OF MANY COPYISTS WHO HAVE IN MOST INSTANCES DONE THEIR WORK WITH MARVELLOUS ACCURACY. BUT COPYISTS HAVE NOT BEEN INFALLIBLE, AND GOD MOST EVIDENTLY HAS NOT SEEN FIT TO PRESERVE THEM ALTOGETHER FROM ERROR IN TRANSCRIBING."
In the following pages of her commentary, Mrs. White testifies further: "I SAW THAT GOD HAD ESPECIALLY GUARDED THE BIBLE" (from what?) "YET WHEN COPIES OF IT WERE FEW, LEARNED MEN HAD IN SOME INSTANCES CHANGED THE WORDS, THINKING THAT THEY WERE MAKING IT PLAIN, WHEN IN REALITY THEY WERE MYSTIFYING THAT WHICH WAS PLAIN, BY CAUSING IT TO LEAN TO THEIR ESTABLISHED VIEWS, WHICH WERE GOVERNED BY TRADITION."
There may be human works, which we cannot accept as the word of God. As there are unscientific facts in the Bible, the same also are there in the Vedas. I do not want to discuss that so we have got no objection that originally Vedas may have been the word of God. Injeel – the Qur’an says Injeel is the wahi given to Isa Alai salaam. It is the revelation given to Jesus (May peace be upon him) so we can say for sure that Injeel was the word of God. And regarding the messengers. Yes! There are several messengers.
Earlier scripts were also time bound. They were only meant for those people at that time and their message is not till eternity. Qur’an is the last and final message is not till eternity. Qur’an is the last and final message of Allah (SWT) even if Injeel, even if Bible, they were for that time not for today. Qur’an is the last and final word of God and the last and messenger is Prophet Muhammad (May peace be upon him). We have to follow the Qur’an and the prophet. Hope that answers the question.