I'm Sure We Have Found “The Altar” of Akeida!
The verse in Vaeyra, Genesis 22:9 states "אֶת־הַמִּזְבֵּ֔חַ", (et-ha-mizbei-ach) "the altar", using the absolute noun.

וַיָּבֹ֗אוּ אֶֽל־הַמָּקוֹם֮ אֲשֶׁ֣ר אָֽמַר־ל֣וֹ הָאֱלֹהִים֒ וַיִּ֨בֶן שָׁ֤ם אַבְרָהָם֙ אֶת־הַמִּזְבֵּ֔חַ וַֽיַּעֲרֹ֖ךְ אֶת־הָעֵצִ֑ים וַֽיַּעֲקֹד֙ אֶת־יִצְחָ֣ק בְּנ֔וֹ וַיָּ֤שֶׂם אֹתוֹ֙ עַל־הַמִּזְבֵּ֔חַ מִמַּ֖עַל לָעֵצִֽים׃

They arrived at the place of which God had told him. Abraham built the altar there; he laid out the wood; he bound his son Isaac; he laid him on the altar, on top of the wood.

The 13th century commentator Chizkuni states: 'את המזבח', 'the altar'. Torah did not write: 'altar' without the prefix letter ה which meant that it was the altar that had previously served such a purpose. According to our tradition, Adam, Abel, Noah and his son, had all offered offerings to G-d on that same altar.

Why would Abraham have to build an altar if this verse refers to the altar by absolute noun? Every altar is designated by its bedrock foundation, a bedrock plinth, which later became a requirement under Jewish law. The plinth connected every boulder and stone assembled on it, by the builder, to the bedrock foundation together constituting "the altar" on which a sacrifice would be offered. So, where is this altar?

Senior archaeologist, Ronny Reich opened his recent work "Excavations in the City of David"; "A moment in which to be born", by explaining that the spring, east of the City, was never called Gihon, instead the Bible called it En Shemesh (Sun Spring). I completely agree, but the spring was also known as a gihon. The spring is a perennial, intermittent gusher, resembling a pump, sometimes gushing, other times flowing, appropriately and descriptively a gihon (meaning; bursting forth or gushing in Hebrew).

Ronny related En Shemesh to sun worshippers of Jeremiah 8:2 and "horses...of the sun abolished by Josiah" (2 Kings 23:11) and that "perhaps at that time the name En Shemesh (Sun Spring) was abolished" along with idolatory. Well Ronny, that is entirely possible, but equally unnecessary because the morning sun still shines on that spring, to this very day and the name En Shemesh does not necessarily denote its association with idolatry.

Having said all this, Ronny used En Shemesh to reconcile a difficult Biblical passage describing the intersect, critical to the altar, on the northern boundary of tribe Judah with the southern boundary of Benjamin. Why is this important? Because the first and second temple altars did not comply with this map, but a recently discovered rock-cut-temple and its altar plinth, on the eastern slope of Mount Moriah, at the location that intersects its southeast corner, does. Could this be Akeida?

North (top)

The Gemara (Zevachim 53b) asks: What is the reason that there was no base on the southeast corner of the altar? Rabbi Elazar says: Because it was not in the portion of land of the one who tears, i.e., the tribe of Benjamin, as he is described in the following manner: “Benjamin is a wolf that tears apart; in the morning he devours the prey, and in the evening he divides the spoil” (Genesis 49:27). As Rav Shmuel, son of Rav Yitzḥak, says: The altar would consume, i.e., occupy, one cubit of the portion of Judah. The part of the altar in Judah’s portion was the southeast corner of the base, and therefore there was no base on that corner.

North (right) - dotted line over SE corner follows Reich map

In addition, there are numerous important Kabalistic or mystical concepts and references to the southeast. But, here Ronny Reich conclusively resolved that the only portion of Judah's land that can possibly intersect the southeast corner of the altar plinth was recently found at the rock-cut-temple, in the City of David and that was last used at the time of Jacob. Further, the only water system at this site, an essential requirement for frequent temple sacrifices, was last used around 3500 years ago.

The 12th Century commentator Rashi, rendered the altar:

North (right)

Shockingly, the southeast and all corners of the altar of the first and second temple, that were built further north, on the summit of Mount Moriah, The Temple Mount, fell entirely within Benjamins territory. No portion of those altars fell in Judah's territory as depicted by the outline of todays, so called, 'Old City' in Ronny Reich's map above and as stated in the Gemara.

The fundamental and indigenous, tribal right to a permanent temple, on their land, belonged to Benjamin. Why? Because, Benjamin did not participate in the sale of Joseph. But, it was not clear to tribe Benjamin which end of its land the temple would be built and that opened grounds for the fiercest tribal competition. Ephraim (Joseph's son) demanded it be on its southern border with northernmost Benjamin, Judah demanded it be on its northern border adjacent to Benjamin's southernmost border.

Following the 300 years of settlement, and a plague that ravaged the nation, King David opposed the ancestral claims of Ephraim and on Prophet Gad's advice he built 'an altar', on the summit of Mount Moriah at a location inside Benjamins land, close to the border with Judah. The language difference for 'altar' used in Tanach is startling - מִזְבֵּ֔חַ (miz-bei-ach) without the ה (ha) prefix; not 'the altar', but he built 'an altar':

וַיָּבֹא־גָ֥ד אֶל־דָּוִ֖ד בַּיּ֣וֹם הַה֑וּא וַיֹּ֣אמֶר ל֗וֹ עֲלֵה֙ הָקֵ֤ם לַֽיהֹוָה֙ מִזְבֵּ֔חַ בְּגֹ֖רֶן (ארניה) [אֲרַ֥וְנָה] הַיְבֻסִֽי׃

2 Samuel 24:18

Gad came to David the same day and said to him, “Go and set up an altar to the LORD on the threshing floor of Araunah the Jebusite.”

David's altar was not described using the absolute noun because it was built where no altar had previously existed yet, after the national pandemonium, all the other tribes agreed with David and contributed to acquisition of the land. David's son Solomon built the First Temple on the summit of Mount Moriah, Jerusalem. In the late second temple period Herod ordered that the summit be walled in by the Temple Mount.

Searching for the place of the original Akeida altar was forgotten, lost for more than 3500 years. Now that we have found it, we are compelled to build the altar, for the Third Temple, at the location of this bedrock plinth on the boundary between Judah and Benjamin that intersects its South East corner.