Altar

An altar is a built structure — of earth, stone, wood, or metal — on which sacrifice or incense is offered, and in Scripture it marks the place where human approach to God is made. In Hebrew the word is mizbeach, from a root meaning to slaughter or sacrifice; the Greek term is thusiasterion. The text introduces altars in the ancestral stories as responses to revelation: Abram builds one at Shechem after Yahweh promises the land to his offspring (Genesis 12:7), and another between Bethel and Ai, where he calls on Yahweh's name (Genesis 12:8). Altar-building is also set in a context of renouncing foreign gods and ritual purification (Genesis 35:2).

Some altars receive names and public meaning. Moses calls the one he builds after the defeat of Amalek "Yahweh our Banner" (Exodus 17:15), and at the base of the mountain he builds an altar with twelve pillars for the twelve tribes after writing down Yahweh's words (Exodus 24:4). An altar can also serve as memorial and boundary marker: the censers of Korah's company were hammered into a covering for the altar so that no outsider would burn incense before Yahweh (Numbers 16:40). Because the altar counted among the holy furnishings, the Kohathites carried it but were forbidden to touch it, lest they die (Numbers 4:15).

Within Israel's worship the altar is a fixed landmark of the sanctuary. Ezekiel sees about twenty-five men stationed between the porch and the altar, their backs to Yahweh's temple, worshiping the sun toward the east (Ezekiel 8:16), and Matthew locates the murder of Zechariah between the sanctuary and the altar (Matthew 23:35). For the psalmist the altar is not an end in itself but a stage on the way to God: "Then I will go to the altar of God, to God, my exceeding joy" (Psalm 43:4). Altars were not unique to Israel — Paul reports one in Athens inscribed "TO AN UNKNOWN GOD" and uses it as a point of contact for his proclamation (Acts 17:23), and ancient non-biblical sources likewise mention altars to unknown gods — while Revelation places a golden altar before the throne, where incense is added to the prayers of all the saints (Revelation 8:3).

Christian traditions differ on what an altar is now. Catholic and Orthodox teaching treats the altar as the consecrated table on which the Eucharist is celebrated, and speaks of it in sacrificial terms; Reformed and much other Protestant teaching prefers the language of the Lord's Supper table and stresses that Christ's sacrifice was offered once for all, so that no altar repeats it; many evangelical churches use "altar" informally for a place or moment of commitment, as in the altar call, without any fixed structure. Historically critical readers often treat the ancestral altar stories as etiological, explaining the origin of sanctuaries, while readers in confessional traditions take them as straightforwardly historical. One way to read the whole range is that an altar is consistently where divine initiative and human response meet — a pattern the texts show without settling the later disagreements.

AI-generated reference entry, grounded in the passages where this term appears — history and Scripture stated as such, interpretation labeled as interpretation. Not a substitute for the text itself.