Exodus 22:18–20

Exodus 22:18–20 lists three capital offenses under the Mosaic Law — sorcery, bestiality, and idolatrous sacrifice — each of which represents a fundamental rupture of the covenant order established by Yahweh at Sinai. Together, these verses define the boundaries of Israel's identity as a holy people set apart from the religious and moral practices of the surrounding nations. They reveal that, for ancient Israel, fidelity to God was not merely a private devotion but a matter of communal life and death.

Verse 18 — "You shall not allow a sorceress to live."

The Hebrew term rendered "sorceress" (מְכַשֵּׁפָה, mekhashshephah) derives from the root kashaph, denoting one who practices magic arts — specifically the manipulation of hidden powers to override the natural or divine order. The feminine form is used here (unusually so among the surrounding legal codes), likely because in Canaanite culture women were disproportionately associated with magical rites linked to fertility religion and necromancy. The prohibition is not incidental; it strikes at the heart of a rival epistemology: the claim that the cosmos can be controlled through hidden techniques rather than submitted to in trust and obedience. In a covenant framework, sorcery is a form of infidelity — an appeal to powers other than Yahweh for security, healing, or knowledge of the future. It is a refusal to depend on God. The death penalty underscores the gravity: sorcery is not a personal eccentricity but an act of communal apostasy, a contagion that threatens the integrity of the covenant people. The Deuteronomic parallel (Deut 18:10–12) lists an entire taxonomy of forbidden arts — divination, augury, sorcery, charming, consulting spirits, and necromancy — all classified as "abominations" (to'evah) that caused the dispossession of Canaan. Saul's consultation of the witch of Endor (1 Sam 28) exemplifies the forbidden act and its tragic consequences.

Verse 19 — "Whoever has sex with an animal shall surely be put to death."

The intensified formula "shall surely be put to death" (môt yûmāt) — a cognate absolute construction in Hebrew — signals the highest degree of legal severity. Bestiality represents a triple violation: of the order of creation (Genesis 1–2 establishes the boundaries of "kinds"), of the covenant vocation of human beings made in the image of God, and of the cultic boundaries separating Israel from the fertility cults of Canaan and Egypt, where sacred sexual acts with animals appear in both text and iconography. Leviticus 18:23 and 20:15–16 expand and repeat this prohibition with equal force. The act is called tevel (תֶּבֶל) in Leviticus 18:23 — "confusion" or "perversion" — a word denoting the mixing of what must remain distinct. In the framework of Genesis, creation is an ordering of distinctions (light/dark, sea/land, kind/kind); this act violates creation's grammar at its most fundamental level. The death of the animal as well (Lev 20:15–16) is not cruelty but a sign that the violation is cosmological, touching the created order itself.

Verse 20 — "He who sacrifices to any god, except to Yahweh only, shall be utterly destroyed."

Catholic tradition illuminates these verses on several levels simultaneously, refusing to reduce them to mere ancient legal curiosities.

The First Commandment as the Foundation of All Moral Order. The Catechism of the Catholic Church (§§2110–2128) treats the First Commandment — "You shall have no other gods before me" — as the root from which all moral life grows. The three offenses in Exodus 22:18–20 are, in effect, violations of this first principle. CCC §2117 explicitly condemns recourse to sorcery, magic, and divination as "gravely contrary to the virtue of religion," noting that they implicitly contradict the honor, respect, and love owed to God alone. The condemnation of idolatrous sacrifice (v. 20) maps directly onto CCC §2112's teaching that idolatry "perverts an innate sense of God" and "consists in divinizing what is not God."

The Dignity of the Human Person. The Church Fathers read the prohibition on bestiality through the lens of the imago Dei. St. John Chrysostom, commenting on Genesis, taught that the human body is a temple consecrated to God, and that acts which degrade it violate not only natural law but theological anthropology. Vatican II's Gaudium et Spes §51 articulates the same principle: the human body participates in the dignity of the person and must not be treated "in a way that is against nature."

Israel's Holiness as Ecclesial Type. The Fathers — especially Origen (Homilies on Leviticus) and Augustine (City of God IV) — read Israel's severe cultic laws typologically: the death penalty for apostasy foreshadows the spiritual death that is mortal sin, and the community's need to expel the apostate prefigures the Church's discipline of excommunication and the call to guard the community's sacramental life. The Council of Trent (Session VI) echoes this when describing how mortal sin involves a complete rupture with God comparable to the covenant rupture these verses address.

Magisterium on Occult Practices. Leo XIII's Humanum Genus (1884) and the Directory on Popular Piety and the Liturgy (2002, §§100–101) continue the Church's consistent condemnation of occult practices as incompatible with Christian faith — a direct continuation of the principle enshrined in verse 18.

These three verses speak with surprising urgency to contemporary Catholic life, though their application requires discernment.

On sorcery and the occult: The explosion of interest in astrology, tarot, Wicca, crystal healing, and New Age spirituality — often framed as "harmless" or even "spiritual" — is directly addressed by Exodus 22:18 and CCC §2117. A Catholic today must take seriously that consulting horoscopes habitually, using tarot cards "for fun," or seeking psychics for guidance is not neutral behavior. These practices gradually transfer one's trust from Divine Providence to rival systems. The antidote is a deepened practice of intercessory prayer, Lectio Divina, and spiritual direction — the genuine Catholic alternatives to occult guidance-seeking.

On idolatry: Verse 20's condemnation of sacrificing to other gods challenges Catholics to examine what functionally receives their ultimate devotion: career, money, political identity, comfort, even family. The ancient Israelite did not always abandon Yahweh but worshipped at multiple altars. The contemporary Catholic temptation is similarly additive — placing national ideology, self-actualization, or consumer identity alongside God rather than beneath Him.

On moral order and creation: Verse 19 invites reflection on the Church's defense of natural law — the conviction that creation has a moral grammar written into it by God, and that human flourishing requires living in accord with that grammar rather than against it.