Cyrill of Alexandria
He referred to Ephraim as Canaan, making it clear, as I have mentioned, that he despised ‘mercy and judgment’ in favor of self-serving, injustice, and various forms of wrongdoing. Now, he seeks to demonstrate that his actions were not only harmful to humanity but that he also shunned approaching God through his deeds. (Jer. 32:21) For He declares, "I brought you out of Egypt." The phrase ‘brought out’ evokes the memories of their plight before they entered the land promised to the forefathers. These occurrences were vast and awe-inspiring. That it was indeed grievous for them to forget these events is evident in His declaration, "I will still set you in the bushes, as it is the day of the feast." This statement will soon be elucidated.
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The Law of Moses ordained that in the seventh month, on the fifteenth day, the Feast of Tabernacles should be observed. The purpose of this celebration is explained by the legislator in the Book of Leviticus: "In the seventh month, you shall celebrate it; in booths you shall dwell seven days; all native Israelites shall dwell in booths, that your generations may know that I made the children of Israel dwell in booths when I brought them out of the land of Egypt: I am the Lord your God" (Leviticus 23:41-43). Consequently, they established a celebration to commemorate the exodus from Egypt. He then questions, “How could you forget Me, who liberated you from Egypt, now being in the booths and using this as an occasion for celebration?” For "I will yet cause you to dwell in the booths as on the day of the feast." The phrase ‘I will dwell’ refers to establishing a presence in the booths during the days of this festival. Thus, forgetting is utterly inexcusable.