Catholic Commentary
A Summons to Total Obedience and Rejection of Foreign Gods
13“Be careful to do all things that I have said to you; and don’t invoke the name of other gods or even let them be heard out of your mouth.
Exodus 23:13 commands Israel to carefully observe all God's commands and forbids invoking the names of other gods or even speaking them aloud. The prohibition protects covenantal fidelity by restricting not merely worship but the utterance itself, treating foreign divine names as unutterable while elevating God's own name to hallowed status.
God forbids not just worshiping other gods but even speaking their names—because our words are acts of worship, and our mouths shape what we truly serve.
Typological and Spiritual Senses
Patristically, this verse was read as anticipating the Church's discipline of the heart and tongue. Origen, in his homilies on Exodus, interprets the foreign gods allegorically as the passions and disordered desires that compete with God for the soul's loyalty. To "invoke" them is to give deliberate consent to temptation; to let them "be heard from your mouth" is to allow the inner disorder to become external, infecting the community. Augustine, likewise, links the discipline of the tongue to the purity of worship — speech that names and invokes evil disorders the whole person (cf. De Doctrina Christiana). In the typological reading, Israel's struggle with foreign gods prefigures the baptized Christian's struggle against the allurements of the world, the flesh, and the devil — the very renunciations made at Baptism.
Catholic tradition reads this verse through the lens of the First Commandment and its exposition in the Catechism of the Catholic Church, which teaches that "God alone is to be worshipped" and that the First Commandment "encompasses faith, hope, and charity" (CCC 2084, 2086). The prohibition on invoking foreign gods is not merely a cultural restriction for ancient Israel; it is a permanent moral imperative grounded in the nature of God as the sole source of being and salvation.
The Council of Trent, affirming the binding moral force of the Decalogue on Christians, grounds this in the fact that natural law and revealed law converge in the command to worship God alone. St. Thomas Aquinas, in the Summa Theologiae (II-II, q. 94), treats idolatry as the gravest of sins against religion precisely because it disorders the fundamental human orientation toward God, the First Cause and Last End.
The Church Fathers drew particular attention to the linguistic dimension of this prohibition. St. John Chrysostom (Homilies on the Statues) taught that the mouth is the instrument of worship and therefore must be guarded with special vigilance — what the lips speak shapes the heart. This resonates with the Catholic understanding of the power of invocation in liturgy and prayer: words are not mere sounds but acts of the will directed toward their object. The Second Vatican Council, in Nostra Aetate (§2), while acknowledging elements of truth in non-Christian religions, reaffirms that the fullness of divine revelation is given in Christ alone — an echo of the exclusive claim this verse makes on Israel's devotion.
The verse thus speaks directly to the Catholic doctrine of the virtue of religion (religio), which obliges the believer to render to God alone the worship due to Him in thought, word, and deed.
The prohibition against invoking other gods "even with the mouth" confronts contemporary Catholics with a surprisingly sharp question: what names do we invoke daily, and with what trust? Modern culture does not present its idols in the form of Baal or Asherah, but in the form of ideologies, celebrities, political messiahs, and the subtle liturgy of consumerism — each offering a kind of salvation, each demanding a form of devotion. The casual invocation of horoscopes, the half-serious "universe" spirituality pervasive on social media, the functional atheism of treating wealth or status as ultimate security — these are the foreign gods whose names slip too easily from Catholic lips.
Practically, this verse calls Catholics to examine their speech as an indicator of their true allegiances. The Liturgy of the Hours, the Rosary, and intercessory prayer are not merely pious habits — they are the covenant discipline of filling the mouth with God's name rather than lesser invocations. Parents can use this verse concretely to form children in the "why" behind the First Commandment: our words shape our worship, and our worship shapes our lives. Confession offers the proper remedy when our invocations have gone astray — naming before God what we have named in His place.
Commentary
Exodus 23:13 — "Be careful to do all things that I have said to you"
The Hebrew verb underlying "be careful" (šāmar, שָׁמַר) is one of the most theologically loaded words in the Torah. It means not merely to observe but to guard, watch over, and keep — as a sentinel keeps a post. It is the same verb used in Genesis 2:15, where Adam is commanded to "keep" (šāmar) the garden, linking Israel's covenant fidelity to humanity's primordial vocation of stewardship and vigilance. The phrase "all things" (kol) is deliberate and uncompromising: Israel is not invited to negotiate which commandments suit her culture or convenience. The totality of the divine word is the object of this watchful obedience.
This verse functions as a hinge or summary clause within the Book of the Covenant (Exodus 20:22–23:33), which began with the prohibition of idolatry (20:23) and here arrives at a sweeping recapitulation before turning to the covenant's ritual calendar. Ancient Israelite legal collections — like the Code of Hammurabi — often conclude with such summary warnings. The divine legislator here distinguishes Himself from all human lawgivers: His law is not a civic compact but an expression of covenantal love demanding a total response of the person.
"Do not invoke the name of other gods"
The prohibition here goes beyond worship or sacrifice; it targets speech itself. The Hebrew tazkirû (from zākar, "to remember" or "to invoke") refers to the liturgical act of calling upon a deity by name, a practice common in ancient Near Eastern ritual — including treaty oaths, prayers, and divination rites. By forbidding the invocation of foreign divine names, God is protecting the integrity of Israel's covenantal memory. To name a god is to acknowledge its existence as a power, to invoke it is to enter into a kind of relationship with it.
"Do not even let them be heard out of your mouth"
This second clause intensifies the prohibition remarkably. It is not enough to refrain from worship or formal invocation — the very sound of these names crossing Israel's lips is forbidden. Jewish tradition would later extend this to extreme reverence for the divine Name itself, but here the emphasis runs in the opposite direction: while God's own name is to be pronounced with reverence, the names of false gods are to be treated as unutterable. There is a striking asymmetry: YHWH's name is given (Exodus 3:14–15) and is to be hallowed; the names of idols are to be erased from the mouth of the covenant people.