What is "ha'Har'el"?
Rashi citing Targum Yonasan: The Mizbe'ach.
Radak (14): It is the area on the Mizbe'ach below on the ground. Har'el is like Beis Kel. Everywhere, people served other gods on high mountains. Har'el was only four Amos tall.
Malbim: It is the place of the Ma'arachah on top of the Mizbe'ach.
What was four Amos?
Rashi: It is the height of the roof of the Mizbe'ach, from the Sovev and above. In Bayis Sheni, it was only three.
Radak (14): It is the area on the Mizbe'ach below on the ground - four Amos length and width, and height. It says four Amos Stam; this includes its length, width and height.
Malbim (13, 15): The Mizbe'ach ascended four Amos above the Sovev to the top of the corners. From Azarah ha'Gedolah (the recession of the Sovev) until the top of the Mizbe'ach was four Amos. Even though it was only three until the Ma'arachah, with the corners (which were one Amah tall) it was four. This completed the 10 Amos height of the Mizbe'ach. Chazal said (Zevachim 53a) that ha'Har'el is four Amos, and the four from Har'el (the Ma'arachah) and below (until Chut ha'Sikra) are the place to put upper blood, and below the Chut, lower blood is put. This was until one Amah below the Sovev, which was four Amos from ha'Har'el (the Ma'arachah). This was in Bayis Sheni, in which the Yesod was one Amah of five Tefachim, and so were the corners. Chut ha'Sikra was in the middle of the remaining eight Amos, which were of six Tefachim. However, in Bayis Shelishi the Yesod will be two Amos of five Tefachim. If so, the middle will be half a. Tefach after four Amos from (below) the corners! We can say that in the future, a boundary one Zeres wide will separate upper and lower blood. It will be four Amos from the corners 1 .
I.e. the boundary will begin there; it will be at least a half-Tefach thick. (PF)
