The Day of Atonement took place on the 10th day of the 7th month. The 7th month closed the festive cycle, the Feast of Tabernacles on the 15th of that month being the last in the year. Before that grand festival of harvesting and thanksgiving, Israel must, as a nation, be reconciled unto God. Only a people at peace with God might rejoice before him. The Day of Atonement becomes so important as preceding the Feast of Tabernacles when we remember how that feast of harvesting prefigured the final ingathering of all nations. Also note that the Jubilee year was always proclaimed on the Day of Atonement.
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