Elul Knocking On Teshuvah

בפסוק כ"ת מחנה כו' ונשמרת כו' פי' כשנכנסין למלחמה עם היצה"ר צריכין שמירה ביותר וכמו כן מכינים אז בשמים סיועות והצלות אל האדם

On the verse, "When you go out as a camp [against your enemies], you shall guard yourself [from every evil thing]" (Devarim 23:10), the explanation is that when one enters into battle with the yetzer hara, he requires extra protection; and correspondingly, at that very time Heaven prepares for a person assistance and rescues from above.

The Torah's command to guard oneself when going out to war hints that battling the yetzer hara demands heightened vigilance, and that Hashem responds by furnishing extra spiritual aid and rescue from above.

ובעבור זה עצמו מתחזק אז גם היצה"ר כדרך המלחמה

And precisely on account of this itself, the yetzer hara too gains strength at that time, as is the way of war.

Because that very help is mobilized, the yetzer hara likewise rouses itself with greater force, since this is the nature of any genuine battle.

וכן בכלל באלה הימים ימי אלול שהם ימי תשובה ומלחמה שע"ז רומז השופר

And so it is in general during these days, the days of Elul, which are days of teshuvah and of war — and it is to this that the shofar alludes.

Elul is itself such a season of both teshuvah and warfare against the yetzer hara, and the sounding of the shofar points to this struggle.

ונפתחין שערי רחמים בשמים בימים אלו שידו פשוטה לקבל שבים

And the gates of rachamim are opened in Heaven during these days, for His hand is outstretched to receive those who return.

During Elul the gates of rachamim swing open in Heaven, for Hashem stretches out His hand to welcome back all who do teshuvah.

ולכן צריך כל אדם להתעורר בתשובה וכמו שדרשו חז"ל בתפלה על פסוק מדוע באתי ואין איש

Therefore every person must arouse himself in teshuvah, as Chazal expounded regarding tefillah on the verse, "Why have I come and there is no man [to answer]" (Yeshayahu 50:2).

Each person is therefore obligated to awaken himself to teshuvah, just as Chazal applied the verse "Why have I come and there is no man" to the absence of those who should be turning to Hashem in tefillah.

כמו כן בימים אלו שהקב"ה פותח יד לדופקי בתשובה צריך כ"א לדפוק עתה על דלתות התשובה וז"ש כי ה"א מתהלך שידע האדם כי הש"י כביכול מקדים ומוכן לעזור להבאים לטהר וכמ"ש במ"א כי ר"ת להצילך כו' הוא אלול:

So too in these days, when the Holy One, Blessed is He, opens His hand to those who knock by way of teshuvah, every person must now knock upon the doors of teshuvah — and this is the meaning of "for Hashem your God walks [in the midst of your camp]" (Devarim 23:15), that a person should know that Hashem, as it were, comes forth first and stands ready to help those who come to purify themselves, as is written elsewhere that the initial letters of "that He may rescue you" (“lehatzilcha”) spell Elul.

Since Hashem opens His hand to those who knock through teshuvah, one must take the initiative to knock at teshuvah's doors now — and the verse that Hashem walks among us, together with the hint that the letters of “lehatzilcha” spell Elul, teaches that Hashem comes forward first, ready to assist all who seek to purify themselves.

Summary: The Sfas Emes explains that going out to war against the yetzer hara, like any battle, calls for extra shemirah, and Hashem answers by preparing heightened assistance and rescue from above — yet that very mobilization causes the yetzer hara to strengthen as well. The days of Elul are precisely such a season of teshuvah and warfare, to which the shofar alludes, and in these days the gates of rachamim are flung open as Hashem extends His hand to receive all who return. Drawing on Chazal's exposition of "Why have I come and there is no man," he urges every person to rouse himself and knock upon the doors of teshuvah now. The verse "for Hashem your God walks in the midst of your camp," together with the hint that the letters of “lehatzilcha” spell Elul, reveals that Hashem comes forth first and stands ready to help all who come to purify themselves.