Ezra 3:4

And they kept the feast of booths, etc. The Feast of Booths, which in the Gospel is called in Greek Skenopegia, that is, the pitching of booths, was a festival of seven days, beginning on the fifteenth day of the seventh month, during which the Lord commanded all the people to make booths for themselves from leaves and branches of the most beautiful trees, and to leave their houses and stay in these booths for seven days, daily studying the decrees of the divine law, and offering burnt sacrifices to the Lord in fire. They were ordered to do all this in memory of the time when they had once come out of Egypt and dwelt in booths in the wilderness, with Moses preaching the law and the divine presence frequently appearing to them, looking forward for a long time to when they could enter the promised land, so that the grace of this great benefit would never fade from their minds. Therefore, those who had come up from Babylon to Jerusalem, with great devotion to carry out all the commands of the Lord, took care to celebrate this feast on the fifteenth day of the seventh month, performing every day of that week the things commanded by the law. All of which we ought to do spiritually with equal devotion. For we too have come out of Egyptian slavery through the blood of the Lamb, so that we might come to the promised land, having been baptized into the sacraments of the Lord's passion, casting off the heavy yoke of trespasses, so that, having been adopted into the liberty of the glory of the children of God, we might be heirs of the heavenly kingdom. For we were dwelling in booths and tents, journeying for a long time through the desert, until we might come to our homeland, when in baptism renouncing not only Satan as the king of Egypt, that is, of darkness, but also all the pomps and works of this age, we promised to be like foreigners and pilgrims in this world, citizens of another life which we hoped for from the Lord. In memory of this hope and promise, we must dwell in booths in the seventh month, that is, being illuminated by the grace of the Holy Spirit, which is described as sevenfold, leaving this world with our whole mind as if it were alien and pressing on us, and fixing our intention on hastening to the unwithering joys of paradise; and we must do this for seven days, that is, during the whole time of the present life, which is circled by as many days,…