Muslims believe that all of God's prophets, which include Abraham, Noah, Moses, Jesus and Muhammad, brought the same message of Pure Monotheism were sent sent message from God through Gabriel the Angel. For this reason, the Prophet Muhammad was not the founder of a new religion, as many people mistakenly think, but he was the final Prophet of Islam. By revealing His final message to Muhammad, which is an eternal and universal message for all of mankind, God finally fulfilled the covenant that He made with Abraham, who was one of the earliest and greatest prophets.
Sufficient is it to say that the way of Islam is the same as the way of the prophet Abraham, because both The Bible and the Quran portray Abraham as a towering example of someone who submitted himself completely to God and worshipped Him without intermediaries. Once this is realized, it should be clear that Islam has the most continuous and universal message of any religion, because all prophets and messengers were "Muslims", i.e. those who submitted to God's will, and they preached "Islam", i.e. submission to the will of Almighty God.
See: A list of the Israelite prophets
The Israelite prophets were extremely learned and pious individuals, both men and women, whose superlative level of piety merited them with visions from God. They had to be humble, yet speak with authority. They had to love their people, yet not hesitate to rebuke with caustic words if commanded to by God. (See: Why did the Prophets rebuke? And see: Why did some people not listen to them?)
The prophets were called upon by God to guide the people and to guide the king. While the king had authority in national matters of state, and the Sanhedrin (Sages) had say in Torah-rulings and halakha (law), the prophets spoke in matters of ethics, of belief, of loyalty to God, and behavior. They rebuked the people at God's command, they predicted events which God revealed to them, they taught through Divine inspiration, and they provided optimism and hope with the prophecies of eventual Redemption.
Some of the prophetical chapters (or books) detail Israelite history and past events, some exhort the people to improve their spiritual level, some predict events and/or warn (especially concerning the First Destruction), some serve to comfort the nation, some speak of prayer and love of God, and some speak of life, experience and wisdom.
See also
Why did prophecy end?
God spoke directly to many Old Testament prophets including Moses, Elijah, Elisha, Joshua and others
THE HOLY QURAN AND HADIDTHS - the way prophet Muhammad(A.S.W) lived
The most sacred text of the Muslims is the holy Qur'an, that is the word of Almighty Allah revealed to the last Prophet of Islam (SAW).The collections of the sayings of the holy Prophet (SAW) are also sacred books of the Muslims.
The Islam sacred text is Quran. It was not invented. Quran was revealed to prophet Muhammad (peace be upon him) by God (or Allah and same God in Judaism and Christianity).
Al-Qur'an is the sacred book of Islam, which is very important
It is Quran. Quran is the Muslims holy book. Quran is revealed by God to prophet Muhammad (PBUH) through the angel Gabriel (Jibril). It reflects the real God words as revealed to prophet Muhammad (PBUH) without a single letter change.
The Torah.
The Holy Bible.
The Quran is still preserved in its original Arabic text since it was first revealed to Prophet Muhammad in the 7th century.
Islam is the religion that has the Qur'an as its holy book. The Qur'an is believed to be the literal word of God as revealed to the Prophet Muhammad. It serves as a guide for Muslims in matters of faith, practice, and morality.
Judaism is not a sacred text, it is a religion and that religion happens to have a sacred text. To learn more about Judaism's Sacred Text, read the Related Question.
The basic text of the Muslims is the holy Qur'an. It is the last heavenly book revealed to the last prophet of Islam Hazrat Muhammad (SAW). It is in Arabic language.
In Islam, there is only one official sacred text-the holy Quraan. As Muslims, we view this text as sacred as it is the complete and unabridged word of our God, revealed to the Prophet Muhammad (peace be upon him). As it is the direct word of God, we treat the text as sacred and with reverence. It is important to us as it tells us what to do in life, and tells us much about previous prophets, and how to do well in life. It also holds some very important orders within it which shape and mould the way we, as Muslims, live our day to day lives today, as we have been doing for generations. Hope this helped! If you have any Muslim friends, then asking them would also help.