Catholic Commentary
Resumption of the Commission and Moses' Renewed Objection
28On the day when Yahweh spoke to Moses in the land of Egypt,29Yahweh said to Moses, “I am Yahweh. Tell Pharaoh king of Egypt all that I tell you.”30Moses said before Yahweh, “Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?”
Exodus 6:28–30 records Yahweh's command that Moses deliver the complete divine message to Pharaoh, followed by Moses' repeated objection that his impure speech disqualifies him from this prophetic task. The passage preserves an unresolved tension between divine sovereignty and human inadequacy as theologically significant rather than problematic.
God entrusts his sovereign word not to those confident in their eloquence, but to those honest about their inadequacy—and their resistance proves the calling is real.
Exodus 6:28 — "On the day when Yahweh spoke to Moses in the land of Egypt"
This opening clause functions as a formal resumptive phrase (the Hebrew wayyomer, "and he said," has been anticipated since 6:10–12), a technique ancient editors used to reorient the reader after a genealogical digression (6:14–27). By repeating the setting — "in the land of Egypt" — the narrator underscores that divine speech is not confined to sacred mountains or holy ground. God speaks within the very territory of oppression and idolatry. Egypt, the paradigm of the world's enslaving powers, cannot silence Yahweh. This geographical insistence is theologically loaded: the word of God penetrates hostile territory.
Exodus 6:29 — "I am Yahweh. Tell Pharaoh king of Egypt all that I tell you."
The divine self-identification "I am Yahweh" (ʾănî YHWH) is the theological heartbeat of Exodus chapters 6–14, appearing like a refrain (cf. 6:2, 6, 7, 8, 29; 7:5, 17). It is not merely a name but a declaration of sovereignty, covenant fidelity, and saving presence. The fuller formula in 6:2–8 connects the name to the promises made to the patriarchs, to redemption from slavery, and to the gift of the land — a densely packed soteriological manifesto. Here, stripped to its essentials, it confronts Moses (and Pharaoh, through Moses) with an absolute: Yahweh alone governs history.
The command "Tell Pharaoh all that I tell you" (kōl ʾăšer ʾădabbēr ʾēlèkā) is equally significant. Moses is not to edit, soften, or strategize the message. The totality of the divine word — not a diplomatic version of it — must reach Pharaoh. This anticipates the prophetic tradition at its most demanding, where the prophet serves as pure conduit rather than interpreter (cf. Jer 1:7; Ezek 2:7).
Exodus 6:30 — "Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?"
The phrase ʿăral śĕpātayim — literally "of foreskin of lips" — is striking, even shocking. "Uncircumcised" in the Hebrew Bible signals what is unfit for sacred use, not yet brought under the covenant's consecrating sign (cf. "uncircumcised heart" in Lev 26:41; Jer 4:4). Moses applies this cultic language of impurity to his own speech organs. His mouth has not been, as it were, consecrated for the divine service it is being asked to render. This is not false modesty: it is a theological statement about the vast distance between creaturely capacity and the demands of prophetic mission.
This is nearly verbatim from 6:12, confirming the resumptive literary structure. But the repetition is not redundancy — it is insistence. Moses' objection does not dissolve in the presence of repeated divine command. The human sense of inadequacy and the divine insistence on commission stand side by side, unresolved except by the promise of God's own enabling. Typologically, the "uncircumcised lips" anticipate Isaiah's "unclean lips" (Isa 6:5) and Jeremiah's "I do not know how to speak" (Jer 1:6), establishing a pattern: authentic prophets resist; false prophets volunteer. The resistance itself is a mark of authenticity.
Catholic tradition reads this passage through several mutually reinforcing lenses.
The Name and Revelation. The Catechism of the Catholic Church (§§203–213) treats the divine name revealed to Moses as the foundation of all subsequent Israelite and Christian theology: "God alone IS" — his name expresses his very being and utter transcendence. The stark "I am Yahweh" of verse 29 is thus not a formality but the most concentrated possible theological statement, the seed of the "I AM" declarations of the Johannine Christ (John 8:58). St. Thomas Aquinas, following this line, saw in YHWH the name most proper to God precisely because it signifies ipsum esse subsistens — subsistent being itself (Summa Theologiae I, q. 13, a. 11).
The Weakness of the Minister. Church Fathers found in Moses' "uncircumcised lips" a paradigm for the theology of ministry: God habitually works through broken instruments so that the glory belongs to him alone. St. Gregory of Nyssa (Life of Moses II.26–27) reads Moses' self-abasement as a model of the soul's proper disposition before divine calling — not a paralysis of despair but a humility that makes room for grace. St. Paul echoes the same structure: "We have this treasure in earthen vessels, so that the surpassing power may be of God and not from us" (2 Cor 4:7). The Catechism affirms (§1548) that ordained ministers act in persona Christi not because of personal worthiness, but because Christ himself acts through them.
Circumcision of the Heart and Lips. Catholic sacramental theology, drawing on Deuteronomy 30:6 and Romans 2:29, understands "circumcision of the heart" as the interior transformation wrought by the Holy Spirit. Moses' "uncircumcised lips" therefore point forward to Pentecost: the Spirit who opens lips for authentic prophecy (Acts 2:4), transforming what is closed and impure into a consecrated instrument of divine speech.
Contemporary Catholics frequently encounter their own version of "uncircumcised lips" — the sense that they are unqualified to speak about faith in hostile or indifferent environments. A parent asked hard questions by a skeptical teenager, a professional in a secular workplace challenged about Catholic moral teaching, a catechist overwhelmed by the scope of what the Church asks them to convey: all inhabit Moses' position in verse 30. The passage offers neither easy reassurance nor permission to stay silent. Instead, it reframes the problem entirely: the issue is not whether our lips are eloquent enough, but whether we are willing to transmit "all that I tell you" — the whole of God's word, unedited. Moses' inadequacy was real and God commissioned him anyway. Catholic spiritual direction has long held that the feeling of unworthiness before a divine calling is often the surest sign the calling is genuine. The practical invitation of these three verses is this: name your "uncircumcised lips" honestly before God in prayer, and then ask not for eloquence but for fidelity to the complete word entrusted to you.