In its primary meaning, the Hebrew word mitzvah (/ˈmɪtsvə/; meaning "commandment", מִצְוָה, [mit͡sˈva], Biblical: miṣwah; plural מִצְווֹת mitzvot [mit͡sˈvot], Biblical: miṣwoth; from צִוָּה ṣiwwah "command") refers to precepts and commandments commanded by God.
It is used in rabbinical Judaism to refer to the 613 commandments given in the Torah at biblical Mount Sinai and the seven rabbinic commandments instituted later for a total of 620. The 613 commandments are divided into two categories: 365 negative commandments and 248 positive commandments. According to the Talmud, all moral laws are, or are derived from, divine commandments.
The opinions of the Talmudic rabbis are divided between those who seek the purpose of the mitzvot and those who do not question them. The latter argue that if the reason for each mitzvah could be determined, people might try to achieve what they see as the purpose of the mitzvah, without actually performing the mitzvah itself (lishmah), which would become self-defeating. The former believe that people were to understand the reason and the purpose for each mitzvah, it would actually help them to observe and perform the mitzvah (some mitzvot are given reasons in the Torah).
The tradition that 613 commandments (Hebrew: תרי"ג מצוות: taryag mitzvot, "613 mitzvot") is the number of mitzvot in the Torah, began in the 3rd century CE, when Rabbi Simlai mentioned it in a sermon that is recorded in Talmud Makkot 23b.
These principles of Biblical law are sometimes called connections or commandments (mitzvot) and referred to collectively as the "Law of Moses" (Torat Moshe, תורת משה), "Mosaic Law", "Sinaitic Law", or simply "the Law". The word mitzvot is plural; singular is mitzvah.
Although there have been many attempts to codify and enumerate the commandments contained in the Torah, the most traditional enumeration is Maimonides'. The 613 commandments include "positive commandments", to perform an act (mitzvot aseh), and "negative commandments", to abstain from certain acts (mitzvot lo taaseh). The negative commandments number 365, which coincides with the number of days in the solar year, and the positive commandments number 248, a number ascribed to the number of bones and main organs in the human body (Babylonian Talmud, Makkot 23b-24a). Though the number 613 is mentioned in the Talmud, its real significance increased in later medieval rabbinic literature, including many works listing or arranged by the mitzvot. Three types of negative commandments fall under the self-sacrificial principle yehareg ve'al ya'avor, meaning "One should let oneself be killed rather than violate it". These are murder, idolatry, and forbidden sexual relations.