And the Lord spoke to Moses on Mount Sinai. Rashi says,
Rashi explains on Mount Sinai: What special relevance does the subject of Shemittah's “release” of fields in the seventh year have to Mount Sinai? Were not all the commandments stated in Sinai? However, this teaches us that just as with Shemittah, its general principles and its finer details were all stated from Sinai; likewise, all of them were stated—their general principles together with their finer details—from Sinai. The insight is that every detail of a mitzvah, whether big or small, was told over to Moshe at Mount Sinai. The Sefer Ach Pri Tevuah from Harav Hershel of Liska says a powerful point, the Torah continues on:
You shall perform My statutes, keep My ordinances, and perform them, then you will live on the land securely. The land will then yield its fruit, and you will eat to satiety and live upon it securely. Says the Lisker Rebbe that these tremendous brachos will be applied to every Mitzvah, since all Mitzvohs were said at Mount Sinai, and the Torah connects all the Mitzvohs to Sinai, and one will get these Brachos.
With this insight, we can explain Mishna Avos 2:1. And be careful with a light commandment as with a grave one, for you did not know the reward for the fulfillment of the commandments. In 4:2, Ben Azzai said, Be quick in performing a minor commandment, as in the case of a major one. These two sayings are actually one outcome; as the Lisker Rebbe says, we have proof from our Parsha showing how we cannot judge the rewards for a Mitzvah.
Avos Perek 4 Mishnah 2 insight
Ben Azzai said: 1] Be quick in performing a minor commandment, as in the case of a major one, and flee from transgression; 2] For one commandment leads to another commandment, and transgression leads to another transgression; 3] For the reward for performing a commandment is another commandment, and the reward for committing a transgression is a transgression. Avos 4:2. To understand the flow of the Mishna, which has three parts. The Mishna begins to be quick at performing a minor commandment. The question is, why shouldn’t one rather be quicker at performing a major command and receive a bigger reward? The answer is: This minor command would bring upon you a major command. However, this doesn’t answer the question. Therefore, it states further: the reward for performing a commandment is another commandment. This means that now that you caused yourself to do a major command by first doing a minor command, the Mishna says that retroactively, the reward for the minor command would now be as great as the major command.
We see in Parshas Bhaloscha Speak to Aaron and say to him, "When you light the lamps, the seven lamps shall cast their light toward the face of the menorah." Aaron did so; he lit the lamps toward the face of the menorah, as the Lord had commanded Moshe. Aaron did so. This shows Aaron’s virtue that he did not deviate from Hashem’s command. This is difficult to understand. Why would we even think that Aaron would deviate? The answer may be that Aaron was distressed that Nesiim brought Karbanos and he didn’t bring a Korban. Then Hashem offered him the task of lighting the menorah, which was not as honorable as bringing a korban, yet Hashem told Aaron, “Yours is greater than theirs, for you will light and prepare the lamps." However, Aaron was satisfied with lighting the menorah, even if it was less than a korban, because Aaron knew that a light commandment is just as important as a major one. Therefore, when Hashem told Aaron, “Yours is greater than theirs,” it was because Aaron was satisfied with it.
