Sibmah
Sibmah is a town east of the Jordan, in the highland country allotted to the tribe of Reuben. It is best known for two things: a vineyard so far-reaching that the prophets used it as shorthand for Moabite prosperity, and a string of name variants — Sebam, Sibmah, Shibmah — that mark the same site as it passes through Israelite, then Moabite, hands.
A Reubenite Town in the Mount of the Valley
When Joshua records the inheritance of the sons of Reuben, Sibmah appears in a list of upland settlements: "and Kiriathaim, and Sibmah, and Zereth-shahar in the mount of the valley" (Joshua 13:19). The town belongs to the tableland east of the Dead Sea, in the country once held by Sihon king of the Amorites and reassigned to Reuben after the conquest of the Transjordan.
Sebam and the Petition for Pasture
The same place enters the narrative earlier under a slightly different name. When the sons of Reuben and the sons of Gad come to Moses asking for the cattle-country east of the Jordan, they enumerate the cities they want: "Ataroth, and Dibon, and Jazer, and Nimrah, and Heshbon, and Elealeh, and Sebam, and Nebo, and Beon" (Numbers 32:3). "Sebam" here is the same town that elsewhere is spelled "Sibmah" — the older transliteration "Shebam" reflects the underlying Hebrew form behind the UPDV's "Sebam."
Rebuilding and Renaming under Reuben
After the request is granted, Numbers tracks the construction work the two-and-a-half tribes carried out on their inheritance. The Reubenite section closes: "And the sons of Reuben built Heshbon, and Elealeh, and Kiriathaim, and Nebo, and Baal-meon (their names being changed), and Sibmah: and they gave other names to the cities which they built" (Numbers 32:37-38). The parenthetical "their names being changed" — flagged in the UPDV as an ancient gloss — registers that the settlements taken from the Amorites were rebadged by their new Israelite occupants. Sibmah is named in the same breath as Heshbon, Elealeh, Nebo, and Baal-meon, the cluster of towns that will appear together again, centuries later, in the prophetic oracles against Moab.
The Vine of Sibmah
By the time of Isaiah, this Reubenite hill country has fallen back under Moabite control, and its vineyards have made it famous. Isaiah's lament for Moab pictures Sibmah as a single sprawling vine whose runners reached far beyond the local hill: "For the fields of Heshbon languish, [and] the vine of Sibmah; the lords of the nations have broken down its choice branches, which reached even to Jazer, which wandered into the wilderness; its shoots were spread abroad, they passed over the sea" (Isaiah 16:8). The image is one of luxuriant, almost runaway, fruitfulness, now smashed by foreign invaders. The prophet's grief is personal: "Therefore I will weep with the weeping of Jazer for the vine of Sibmah; I will soak you with my tears, O Heshbon, and Elealeh: for on your summer fruits and on your harvest the [battle] shout is fallen" (Isaiah 16:9). The harvest cry that should have rung over the vineyards has been replaced by the war-cry of an enemy.
Jeremiah's Echo
Jeremiah's oracle against Moab takes up Isaiah's image almost word for word, intensifying the lament: "With more than the weeping of Jazer I will weep for you, O vine of Sibmah: your branches passed over the sea, they reached even to the sea of Jazer: on your summer fruits and on your vintage the destroyer has fallen" (Jeremiah 48:32). The same far-reaching vine, the same paired weeping with Jazer, the same destroyer falling on summer fruit and vintage — Sibmah has become, in the prophetic vocabulary, the standing emblem of Moab's vineyard country and of its ruin.
Names of One Town
Three forms attach to this single Reubenite site across the canon: Sebam in the petition of Numbers 32:3, Sibmah in the building list of Numbers 32:38, in Joshua's allotment in Joshua 13:19, and in the prophetic vine-laments of Isaiah 16:8-9 and Jeremiah 48:32. (Older translations and topical indices also catalogue the variants "Shebam" and "Shibmah" for the first and last of these.) The shifts in spelling track the town's passage from Amorite holding, to Reubenite rebuild, to Moabite vineyard — and finally to the name a prophet weeps over.