Different Jews may have different answers on this. Most will probably say that the Torah is the most important document, but others believe that the Talmud is more important to daily life than the Torah is.
The most important Jewish Holy Book is the Torah. Which means 'teaching' or 'instruction.'
Read more about this at the Related Question.
It is called th TORAH :]
A Bible is the most important Christian holy book.
The Tanakh (Jewish Bible).
The Holy Book of Judaism is the Tanakh. Israel is a nation without an official state religion. (While Israel is the Jewish State, it is only Jewish in the ethnic sense, not the religious sense.) Most Israelis are Jews, but there are Muslim, Christian, Druze, and Baha'i minorities who each have their own holy books. To read more about the Jewish Holy Book, please read the Related Question below.
The Holy Koran
The Holy Koran
The most important book of Islam is the holy book of Islam which is the Quran.
Mohammed, Jesus, Abraham, Sidharta/Buddha...
The difference between Hasidic Jews and Jews of other sects is their interpretation and perception of the Religious Law, not their holy books. They have the same holy books as the rest of the Jewish people.To see what the Jewish Holy Books are, view the Related Question.
Iranians are a national group, not a religious group and as a result do not have a holy book as such. Currently, most Iranians are Muslims and would have the Qur'an as their holy book. A minority of Iranians today are Baha'i, Jewish, Christian, and the original Iranian Religion: Zoroastrian. Their holy books are: the Kitáb-i-Aqdas, the Torah, the Bible, and the Avestas.
There are loads of different Sikh holy books but the most important one is the guru granth sahib. The second most important book is called the Dasam Granth. The guru granth sahib is the mot important as it is treated as a hman guru I hope this information is helpful!
Rosh Hashanah and Yom Kippur.
No. Judaism does not believe the New Testament to be a Holy Book in its traditions.