Amos 9:11

In that day will I raise up the tabernacle of David that is fallen and close up the breaches thereof; and I will raise up his ruins, and I will build it as in the days of old, that the rest of men and all …

What then was the tabernacle in which He dwelt? Hear the Prophet say; "I will raise up the tabernacle of David that is fallen." It was fallen indeed, our nature had fallen an incurable fall, and needed only that mighty Hand. There was no possibility of raising it again, had not He who fashioned it at first stretched forth to it His Hand, and stamped it new with His Image, by the regeneration of water and the Spirit. And observe I pray you, the awful and ineffable nature of the mystery. He inhabits this tabernacle for ever, for He clothed Himself with our flesh, not as again to leave it, but always to have it with Him. Had not this been the case, He would not have deemed it worthy of the royal throne, nor would He while wearing it have been worshiped by all the host of heaven, angels, archangels, thrones, principalities, dominions, powers.

The tent of David means the race of the Jews. It must be known that after Cyrus had freed Israel from captivity, they returned to Judea and built the temple of God. Then, after they had again fortified the cities that had been destroyed before, they lived in security day by day for a long time. While such is the factual reference in the passage, the deeper meaning closer to reality would be in Christ. For since, as I said, Christ came back to life; for the Father raised the tent of David, and rebuilt its ruins, a great and abundant participation in spiritual goods has come upon all people, both Greeks and Jews; "For God is one, who has justified the circumcision by faith, and the uncircumcision through faith." Therefore, a very great supply of spiritual fruits is given to those who have believed, which is very well signified through earthly fruits.

But let us hear what Hosea goes on to say: "And after this the children of Israel shall return, and shall seek the Lord their God, and David their king. And they shall fear the Lord and his goodness in the last days." You will never find a prophecy plainer than this, for the name king David means Christ who, as St. Paul says, "was born according to the flesh of the offspring of David." Further on still, Hosea foretold the resurrection of Christ on the third day, but in the mysterious way that is proper to prophecy. He says, "He shall heal us after two days, and on the third day we shall rise up again." This is the idea underlying the words of St. Paul: "Therefore if you have risen with Christ, seek the things that are above." The prophet Amos too has predictions not unlike those of Hosea. He says, "Be prepared to meet your God, O Israel, for behold, I am the one who forms the thunder, and creates the wind, and declares to men their Christ." And, in another place: " 'In that day I will raise up the tabernacle of David that is fallen. And I will close up the breaches of the walls thereof and repair what is fallen. And I will rebuild it as in the days of old, so that the remnant of men may seek me out, and all nations, because my name is invoked upon them,' says the Lord that does these things."

(Vers. 11 seqq.) In that day I will raise up the fallen tent of David, and rebuild its broken walls, and restore what has collapsed, and rebuild it as it was in ancient times, that they may possess the remnant of Edom and all the nations who are called by my name, declares the Lord who is doing these things. LXX: In that day I will raise up the fallen tent of David, and rebuild its broken parts, and raise up what has been buried, and restore it as in the ancient days, that they may seek me, the remnant of humanity, and all the nations over whom my name has been called, declares the Lord who is doing all these things. Where the authority of the apostles prevails, especially that of Peter and James, whom the vessel of election calls the pillars of the Church (Galatians 2), there all suspicion of various explanations is to be removed, and what is expounded by such great men is to be followed. In the book of Acts, a question arose among the apostles as to why Paul and Barnabas had received men from the Gentiles without circumcision and observance of the Sabbath. Peter answered, as he should: and James, approving his opinion, spoke these words: Men, brothers, listen to me: Simon has related how God first visited the Gentiles to take from them a people for his name, and the words of the prophets agree with this, as it is written: After this, I will return and rebuild the fallen tent of David. I will rebuild its ruins and set it up again, so that the rest of mankind may seek the Lord, even all the Gentiles who are called by my name, says the Lord, who does these things, known from of old (Acts 15:13 and following). […]