Leviticus 11:20–23

In these four verses, God instructs Israel on the status of winged, crawling insects: as a general rule, those that "walk on all fours" are forbidden as abominations, yet a specific class — those with powerful jumping legs, including locusts, katydids, crickets, and grasshoppers — is explicitly permitted for eating. The passage illustrates the granular precision of Israel's holiness code and the theological conviction that every domain of created life, down to the smallest creature, falls under God's ordering will. Far from arbitrary taboo, these distinctions carried deep symbolic, moral, and ultimately Christological weight that Catholic tradition has continually unpacked.

Verse 20 — The General Prohibition "All flying insects that walk on all fours are an abomination to you." The Hebrew שֶׁ֖רֶץ (shérets), translated "creeping things" or "swarming things," denotes creatures that teem or swarm close to the earth — evoking the primordial chaos of Genesis 1:20. The category here is paradoxical by design: creatures that have wings (suggesting elevation, freedom, the air) yet are bound to the earth by crawling locomotion. This mixed nature — belonging neither fully to the sky nor properly to the ground — is precisely what marks them as anomalous and therefore impure within Israel's classification system. As the anthropologist Mary Douglas influentially argued, and as Catholic scholars have affirmed within a more theological frame, the Levitical system values wholeness, proper-category-ness, and completion in every living thing, reflecting the integrity of God's own creative act. The word תּוֹעֵבָה (toevah, "abomination") is strong: it signals not merely legal prohibition but something that stands in opposition to the ordering holiness God intends for his people.

Verse 21 — The Crucial Exception Introduced "Yet you may eat these: of all winged creeping things that go on all fours, which have long, jointed legs for hopping on the earth." The exception carves out a sub-category within the forbidden class. The distinguishing mark is the jointed rear leg built for leaping — a trait that lifts the creature off the earth and propels it upward, giving it a mode of movement that aligns it symbolically with the air rather than with earthbound crawling. The Hebrew כְּרָעַיִם (kera'ayim), "legs," specifically denotes the elongated, articulated leaping legs of the orthoptera. This anatomical detail is not incidental: it is the creature's mode of transcending its crawling nature that renders it permissible. Jewish and Christian interpreters alike have seen here a figure of the soul's capacity to rise above what is merely earthly — to "leap" toward the divine even while remaining in this world.

Verse 22 — The Four Permitted Genera "Any kind of locust, any kind of katydid, any kind of cricket, and any kind of grasshopper." The four Hebrew terms — אַרְבֶּה (arbeh), סָלְעָם (sal'am), חַרְגֹּל (hargol), and חָגָב (hagav) — cover the family of orthoptera, with the common thread being their leaping locomotion. The fourfold enumeration signals thoroughness: every variety within this class is declared licit, not just one exceptional species. This generosity within the exception is significant — God's permission is as detailed and comprehensive as his prohibition. The locust in particular holds enormous resonance in Israel's memory: the eighth plague of Egypt (Exodus 10) unleashed locusts as an instrument of divine judgment, and yet here the same creature is granted as food. What was once a sign of wrath becomes, under the covenant's ordering, a permitted gift — a small but real foreshadowing of how divine economy can transform what seemed cursed.

Catholic tradition brings several distinctive lenses to this seemingly arcane passage. First, the Church affirms — against Marcionite tendencies that would discard the Old Law as merely burdensome or irrational — that the Mosaic legislation possesses genuine wisdom and a positive function in salvation history. The Catechism teaches that "the Old Law is the first stage of revealed Law" and that its moral, ceremonial, and juridical precepts served to "prefigure and prepare" the New Covenant (CCC 1961–1964). These food laws, while not binding on Christians (cf. Acts 10:9–16; Mark 7:19), were never arbitrary: they schooled Israel in discernment, in the habitual practice of distinguishing, and in the conviction that holiness permeates every act, including eating.

St. Thomas Aquinas, in the Summa Theologiae (I-II, q. 102, a. 6), treats the dietary laws with characteristic precision, arguing that they have a threefold rationale: literal (health and social distinctiveness), moral (training against disordered appetite), and figurative (symbolizing virtuous versus vicious persons and acts). On the leaping insects, Aquinas follows the Fathers in seeing the leap as a figura of the upward movement of the soul in contemplation — the creature that lifts itself, even briefly, above the earth represents the Christian who, while dwelling in the world, does not belong to it (cf. John 17:14–16).

Pope Benedict XVI, in his Jesus of Nazareth, reflects on how Jesus's fulfillment of the Law does not abolish its inner logic but brings it to its telos. The distinctions of Leviticus 11 find their ultimate resolution in Christ, who is himself the perfectly pure and holy one, the Lamb without blemish (1 Peter 1:19), in whom all creation's ordering toward God is achieved. What the Law mapped in the realm of creatures, the Incarnation accomplishes in the realm of persons.

Contemporary Catholics rarely encounter Leviticus 11 in Sunday Mass, yet it offers a surprisingly practical spiritual challenge. The core discipline of this passage is discernment — the practiced, habitual capacity to distinguish between what elevates the soul and what drags it earthward. In a media-saturated culture that constantly presents a mixture of the winged and the crawling — things that appear elevating but ultimately grovel along the ground — this ancient code is a school in attentiveness. Ask yourself: what am I routinely consuming — content, conversations, habits — that has the appearance of freedom (it flies!) but in practice keeps me earthbound? The leaping locust is the model: it remains in this world, it does not fly away from embodied life, but its characteristic motion is upward. St. Ignatius of Loyola's Rules for Discernment of Spirits are a New Covenant equivalent of this passage: learn to distinguish movements that ultimately descend from those that ultimately ascend. Leviticus trains us to see that no corner of daily life — not even what we put in our mouths — is outside the sphere of holiness.