And in mercy shall the throne be established: and he shall sit upon it in truth in the tabernacle of David, judging, and seeking justice, and hastening righteousness.
Read Chapter 16
Eusebius of Caesarea
AD 339
According to Aquila, “his throne will be established in mercy,” or according to Theodotion, “the throne will be established with mercy.” Who will establish the throne? Or how is Christ born from the posterity of David? The throne will be established by the Moabites, according to the text; and Christ who is born from the tent (tabernacle) of David will sit upon the throne. By “the tent of David” the prophet means the church of God. David himself is called christ because from his posterity Christ is born according to flesh. Therefore, the tent (tabernacle) of David is the church, and the throne belongs to the head of the church. It refers to the humanity of Christ. Therefore, one should contemplate on the mystery of Christ revealed in the prophecy only in the Holy Spirit; and in such a cautious contemplation curiosity and speculation must be tamed. - "Commentary on Isaiah 16.1–5"
“And a throne will be prepared in mercy, and on it will sit in truth, in the tabernacle of David, one who judges and seeks judgment and quickly renders what is just.” The Hebrews interpret this to mean that Hezekiah, a just man, after having expelled the Assyrians, will retain the throne of David and rule Judah, adjudging the people of God to be subject to himself in truth. Others understand that it is about Christ. With the antichrist reduced to dust and with the oppressor who had trampled all the earth removed, Christ the King will come and sit in the tabernacle of David and render to each person according to his works on the day of judgment. Neither is there any doubt that this chapter prophesies of Christ. But we are also able to understand the same thing in the first advent and to demonstrate in the tabernacle of the church that the surging victories of the churches of Moab in all the earth testify to the dominion of Christ. - "Commentary on Isaiah 5.16.5"