The Covenant at Sinai, Pikuach Nefesh, the Mitzvot and Life After Death
The Covenant at Sinai
A covenant is at the heart of Judaism. The most important covenant for Jewish law and practice is the Sinai Covenant, recorded in Exodus 20. Through Moses, the Almighty gave the whole Jewish people the Decalogue — the Ten Commandments. Moses is central to this covenant: he led the Israelites out of slavery in Egypt, climbed Mount Sinai to receive the law, and brought it back down to the people, becoming the mediator between the Almighty and Israel.
The Ten Commandments are traditionally divided five and five. The first five concern duties towards the Almighty: acknowledging the Lord as God; having no other gods or idols; not misusing the divine name; keeping Shabbat holy; and honouring one’s father and mother. The second five concern duties towards other people: not murdering; not committing adultery; not stealing; not giving false testimony; and not coveting what belongs to a neighbour.
The Sinai Covenant (Exodus 20) gave the Jewish people the Decalogue through Moses. It divides into five commandments about duties to the Almighty and five about duties to other people — together forming the foundation of Jewish law and ethics.
Why the Decalogue Matters Today
Jews today do not all understand the importance of the Decalogue in the same way. For many Orthodox Jews, the Ten Commandments are binding divine law, given directly by the Almighty at Sinai and unchanging — they must be observed literally, for example through strict Shabbat rest. Many Reform Jews instead see the Decalogue as a foundation of ethical principles that must be reinterpreted for modern life; the underlying values, such as honesty and respect for parents, matter more than following every detail in the same way it was followed centuries ago.
This divergence matters because it shapes everyday practice. An Orthodox Jew is likely to treat all Ten Commandments, including detailed Shabbat law, as directly binding today. A Reform Jew may keep the same commandments in spirit — for example, resting and reflecting on Shabbat — without following every traditional restriction. Both agree the Decalogue remains central to Jewish identity; they disagree about how literally its details must be applied.
Sanctity of Life and Pikuach Nefesh
Judaism teaches the sanctity of life: every human life is holy because it is created by the Almighty. Life is shown as special throughout Jewish teaching — to save one life is treated as equivalent to saving an entire world, because human life carries infinite worth.
This belief leads to Pikuach Nefesh — the principle that preserving life overrides nearly every other commandment. The named source is Talmud Yoma 83–84, which teaches that Shabbat laws may be broken to save a life: a child who falls into the sea should be pulled out with a net, a child trapped in a pit should be dug free, and a locked door should be broken open to reach a frightened child — all on Shabbat, without delay. In practice, this means a Jewish doctor can and must treat a patient on Shabbat, and a pregnant woman need not fast on Yom Kippur if fasting would endanger her health.
Pikuach Nefesh (Talmud Yoma 83–84) means that preserving life takes precedence over almost every other Jewish law, including Shabbat. This is because human life is sacred and carries infinite worth in Jewish belief.
Orthodox Jews apply Pikuach Nefesh carefully and case by case: a commandment is set aside only where there is a genuine and immediate threat to life, decided by a rabbi where possible. Reform Jews often apply the principle more broadly, extending it to include serious risks to mental health and long-term wellbeing, not only physical emergencies. This affects real decisions, such as whether fasting on Yom Kippur or restrictions at the end of life should be relaxed.
Moral Principles and the Mitzvot
The Mitzvot (singular: mitzvah) are the 613 commandments found in the Torah. They cover the whole of Jewish life, from worship and food laws to business dealings and charity. The named source for their philosophical foundation is the Mishneh Torah of Maimonides, specifically the Sefer Madda (Book of Knowledge), which sets out the principles underlying Jewish law and belief.
The Mitzvot fall into two broad groups: commandments between a person and the Almighty, such as prayer, Shabbat and keeping kosher, and commandments between one person and another, such as honesty, charity and care for the vulnerable. Jews divide over which group matters most for life today. Many Orthodox Jews argue both groups carry equal weight, since both are commanded by the Almighty. Many Reform Jews place greater emphasis on the ethical Mitzvot between people, seeing them as more central to living a good Jewish life in the modern world, while treating some ritual Mitzvot as adaptable.
Keeping the Mitzvot only has moral meaning because Jews possess free will. The Almighty does not force obedience. Maimonides taught that the Almighty’s knowledge of what a person will choose does not remove that person’s freedom to choose it — if it did, reward and punishment for keeping or breaking the Mitzvot would be unjust.
The 613 Mitzvot (Maimonides’ Mishneh Torah, Sefer Madda) divide into duties to the Almighty and duties to other people. Because Jews keep them through free will rather than compulsion, obedience and disobedience both carry moral significance.
Jewish Beliefs about Life after Death
Jewish teaching about life after death is less fixed than in some other religions, because the Torah focuses mainly on living ethically in this world. The named source is Ecclesiastes 12, which reflects on human mortality and describes the human spirit returning to the Almighty who gave it. This reflective, open language has allowed divergent Jewish understandings of what happens after death to develop over time.
Orthodox Judaism affirms techiyat ha-meitim, bodily resurrection in the Messianic age, together with judgement and the Olam Ha-Ba (World to Come). Many Reform Jews place less weight on physical resurrection, focusing instead on the spiritual legacy left by a person’s good deeds. Belief in life after death matters to many Jews today because it offers hope of justice beyond this life, comfort in bereavement, and a reason to live ethically now, since actions are believed to matter beyond death.
Contrasting Jewish beliefs about the afterlife with those of another religion can sharpen your understanding. Christianity, for example, teaches resurrection through Jesus, who said, “I am the resurrection and the life. The one who believes in me will live, even though they die” (John 11:25). Both religions link ethical living now to what happens after death. However, Orthodox Jewish resurrection is tied to a future Messianic age for the Jewish people as a whole, while Christian resurrection is linked to individual faith in Jesus’s own resurrection. Judaism also has far less defined teaching on heaven and hell than Christianity.