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The following is a description of the Rebbe Rayatz on Shabbos Mevarchim Chodesh Elul in Lubavitch: “On Shabbos Mevarchim Chodesh Elul in Lubavitch, although it was still a clear summer day, the atmosphere had already changed. The smell of Elul had already become felt, and the spirit of repentance already began to blow. Every Jew became calmer, more contemplative in his thoughts, and forgetful of his material matters. With great anticipation the people began waiting for the saying of Ledavid Hashem Uri and the sound of the Shofar which heralded the opening of the gates of mercy. This Shabbos was different than every other Shabbos. Each person was more secluded to himself and in the saying of Tehillim could be heard a voice of sincerity.”
The Rebbe expounded upon each term used by the Rebbe Rayatz explaining how it is not just descriptive poetry but an analyzed statement of the different spiritual effects of Elul.
 Likkutei Deburim Vol 1 page 151-158
 Likkutei Sichos 19 p. 158