Catholic Commentary
The Ark of the Covenant Is Installed Behind the Veil
20He took and put the covenant into the ark, and set the poles on the ark, and put the mercy seat above on the ark.21He brought the ark into the tabernacle, and set up the veil of the screen, and screened the ark of the covenant, as Yahweh commanded Moses.
Exodus 40:20–21 describes Moses placing the covenant tablets inside the Ark, attaching its carrying poles, and setting the mercy seat above it before positioning the Ark behind the inner veil of the Tabernacle. These actions established the sacred center of Israelite worship, where God's law, atoning presence, and portable covenant dwelling were unified according to divine command.
The Ark contains the Word of God, and where God's Word dwells, that place becomes holy—so does wherever we carry Jesus in our hearts.
Exodus 40:20 — The Threefold Act of Consecration
Verse 20 describes three distinct and deliberate actions, each freighted with covenantal meaning. First, Moses "took and put the covenant into the ark." The word "covenant" (Hebrew: ha-edut, literally "the testimony" or "the witness") refers to the two tablets of the Law inscribed by God himself (Exod 31:18; 34:1). This is not merely bureaucratic filing. The tablets are placed inside the Ark because the Law is the very substance of the relationship between Yahweh and Israel; the Ark is its living shrine. The chest is thus defined entirely by what it contains: it has no identity apart from the covenant it houses.
Second, Moses "set the poles on the ark." The carrying poles, threaded through golden rings on the Ark's sides, had been mandated earlier (Exod 25:13–15) with the striking instruction that they were never to be removed. The permanence of the poles signals that the Ark always retains its readiness for movement — it is the God who journeys with his people, whose presence is not fixed to geography but to covenant fidelity. In this, the poles are a theological statement: Yahweh accompanies Israel wherever she goes.
Third, Moses places the kapporet — the "mercy seat" (Greek: hilastērion; Latin: propitiatorium) — above the Ark. This golden slab, flanked by two cherubim whose wings arched over it, was more than a lid. It was the specific site where the high priest would sprinkle blood on the Day of Atonement (Lev 16:14–15) and where Yahweh declared he would meet Moses and speak (Exod 25:22). The mercy seat is thus the locus of divine-human encounter, the point at which justice (the Law within) and mercy (the atoning blood upon) converge.
Exodus 40:21 — The Veil as Sacred Boundary
Moses then carries the Ark into the Tabernacle — specifically, behind the parokhet, the inner veil separating the Holy of Holies from the Holy Place. The language "screened the ark of the covenant" uses a verb rooted in concealment and protection. The veil does not simply hide the Ark from curiosity; it demarcates the threshold of divine holiness. To pass the veil uninvited was to invite death (Lev 16:2); only the high priest, once a year, on the Day of Atonement, could draw back this curtain. The threefold repetition of "as Yahweh commanded Moses" (which echoes throughout Exod 39–40 like a refrain) underlines that every detail of this installation is an act of obedience, not invention. Moses does not improvise the sacred; he receives and transmits it.
The Typological Sense
The literal meaning opens onto a rich typological landscape. The Ark containing the Word of God prefigures the Virgin Mary, who carried within her womb the incarnate Word. The mercy seat, where blood is offered and God speaks, anticipates the altar of sacrifice where Christ's body and blood are made present. The veil that screens the Ark from unworthy eyes points toward the sacred concealment of the Eucharistic presence — veiled under sacramental signs, accessible only through faith and priestly mediation. The poles that keep the Ark ever-mobile prefigure the Church herself, a pilgrim people in whom the living Word travels through every age and nation.
Catholic tradition uniquely brings the full weight of typology, Mariology, and Eucharistic theology to bear on these two verses.
The Ark as Type of Mary. This is among the most ancient and consistent typological readings in the Church. St. Athanasius of Alexandria (Homily of the Papyrus of Turin) addressed Mary directly as "true Ark of the New Covenant," and St. Ambrose developed the parallel with precision: as the Ark held the tablets of the Law, the manna, and Aaron's rod, so Mary bore in her womb the Lawgiver himself, the true Bread from heaven, and the eternal High Priest. The Catechism of the Catholic Church §2676 names Mary "Ark of the Covenant" within its treatment of the Hail Mary, linking this Old Testament image to the Annunciation (Luke 1:35), where the Spirit overshadows her as the glory-cloud overshadowed the Ark (Exod 40:34–35). The Ark did not define the tablets; the tablets defined the Ark. So too, Mary's identity is constituted entirely by the One she bore and to whom she belongs.
The Mercy Seat as Eucharistic Type. St. Paul uses hilastērion — the exact Septuagint word for the mercy seat — to describe Christ himself in Romans 3:25: "God presented him as a hilastērion through faith in his blood." The Council of Trent (Session XXII) taught that the Mass is the unbloody re-presentation of the one sacrifice of Calvary. The altar, in Catholic liturgical theology, is thus the New Covenant mercy seat: the place where the blood of Christ is offered, where justice and mercy meet, and where God speaks to his people in Word and Sacrament.
The Veil and Sacred Concealment. The Letter to the Hebrews (10:19–20) identifies the torn veil of the Temple with the flesh of Christ: "the new and living way opened through the curtain, that is, his body." Obedience to the divine command (as Yahweh commanded Moses) becomes, for Catholics, the model of the Church's liturgical fidelity — the sacred rites are not human invention but divine gift, received and handed on intact.
For a contemporary Catholic, these two verses illuminate something easily lost in an age of religious informality: the distinction between the holy and the common is not arbitrary elitism but a safeguard of divine generosity. The veil does not keep God away from his people — it marks the extraordinary privilege of his nearness. When Catholics genuflect before the tabernacle, observe silence in the sanctuary, receive Communion with reverence, or observe the rubrics of Mass carefully, they are doing what Moses did: honoring a structure they did not invent because it houses a presence they did not deserve.
More personally, the image of Moses placing the covenant inside the Ark before anything else invites an examination of what is at the center of one's own spiritual life. Is the Word of God — Scripture, the Creed, the Church's teaching — genuinely interior, carried within, or merely decorative? Eucharistic adoration becomes a direct encounter with this passage: the veiled presence, the hushed approach, the mercy seat where the baptized may speak and be heard. These verses are an invitation to recover a sense of holy awe — not as fear of an angry God, but as the proper human posture before overwhelming, freely offered Love.
Commentary