Commentary for Isaiah 29:1

Woe, Ariel Jonathan renders: Altar of the Lord. Ezekiel, too, called it that, as it is said (43: 16): “And the altar (וְהָאֲרִיאֵל) twelve [cubits] in length,” [because of the heavenly fire that lay like a lion atop the altar, as we learned in Tractate Yoma (21b)]. Our Sages, however, explained it in reference to the heichal (the Temple proper), which was narrow from the rear and wide in the front.

Ariel. Jerusalem. According to some, Ariel is the name of Jerusalem, on account of the altar therein, which is called הראל and also אריאל Harel and Ariel (Ez. 43:15, 16); for the letters אׄ הׄ וׄ יׄ interchange¹Strictly speaking, there is, besides the interchange of א and ה, the omission of י in הראל.; according to others, on account of her planet being the lion; but this is absurd.

the city wherein David encamped The altar that was built in the city wherein David encamped [from Jonathan].