ספר דברים - פרשת וילך - לא:ד-ו - שני

Verse four says: "And Hashem will do to them as He did to Sichon and Og, the kings of the Emori, and to their land, which He destroyed." The pasuk is telling us that just as Hashem destroyed Sichon and Og, who were the powerful kings of the Emori, and took away their land, so too Hashem will do to the nations that the Jewish people are about to face as they enter Eretz Yisroel. The Torah is reminding the people of these past victories to give them confidence that Hashem will continue to help them overcome their enemies in the future, just as He did before.

Verse five continues: "And Hashem will give them before you, and you shall do to them according to all the mitzvos that I have commanded you." This means that Hashem will deliver the nations into the hands of the Jewish people, and they are to deal with them in the way that Hashem has instructed—following all the mitzvos that Moshe has commanded. The emphasis here is on acting according to the Torah's instructions, not just conquering for its own sake, but doing so in line with the commandments that were given to them.

Verse six says: "Be strong and courageous, do not fear and do not be dismayed from them, because Hashem your God—He is the one that goes with you. He will not fail you and He will not forsake you." Here, Moshe is encouraging the people to have strength and courage as they face the challenges ahead. He tells them not to be afraid or broken by their enemies, because Hashem Himself is going with them. The assurance is that Hashem will not let them down—He will not fail them or abandon them. This is meant to give them confidence and trust as they prepare to enter the land and face whatever comes their way.

On the words "Lo yerpecha"—Rashi explains that this means "He will not give you weakness." In other words, Hashem will not allow you to become weak or abandoned by Him. The idea is that Hashem will not let you lose your strength or support, so you do not have to worry about being left on your own. Rashi is clarifying that the promise is not just that Hashem won't leave, but that He won't even allow you to feel weakened or unsupported in the first place.