Israel is a modern country with a secular government. (There are religious parties in the government, but it is not a theocracy.) Israel has no sacred texts (just like Britain, France, India, Thailand, and all other nations do not have sacred texts), but like all countries, it has a Constitution. In the Israeli Case, similar to the British Case, the Constitution is not one document, but several Basic Laws that work together to form a unified set of parameters for the Israeli government.
If you meant to ask what the sacred texts of Judaism are called, please see the Related Question below which discusses the Jewish Holy Book called the Tanakh or Jewish Bible.
It is also worth noting that while Israel is the Jewish State, there are a number of religious minorities in Israel aside from Jews. These minorities include Muslims, Christians, Druze, and Baha'i among its citizens and include Hinduism, Sikhism, Shenism and Confucianism additionally among its resident guest workers. Each of these religions has its own holy books, all of which are freely accessible and readily available within Israel.
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The sacred text of Israel is called the Torah, which is the central reference of the religious Judaic tradition. It consists of the first five books of the Hebrew Bible, which are Genesis, Exodus, Leviticus, Numbers, and Deuteronomy.