And six years you shall sow, etc. It says in the Midrash that even if a person has only one ruin in the midst of his garden, he is obligated to work it every day. And it appears to Rabbi Moshe that this applies specifically in the Land of Israel in order to increase the separation of terumot and maasrot.

Behold, I am sending an angel. By merit of the Ten Commandments that begin with "I am", I am sending an angel before you to guard you. Alternatively, the Holy One, blessed be He, said to him, "Behold I am sending an angel." Moses said to Him, "I am not asking for an angel to go with us, but You in Your glory. And if Your presence does not go with us, we will not move from here." The Holy One, blessed be He, said to him, "I am not even sending an angel, just the hornet," as it is written, (Deuteronomy 7:20) "And also the hornet." And specifically in this world He sends the hornet, but in the future world (Malachi 3:23) "Behold I am sending Elijah the prophet to you", as it says, "Behold I am sending an angel before you."

For he will not pardon your transgression. Wherever he is sent, he performs his mission but is unable to show favor, as it is written "May the Lord lift up His countenance", and not an angel. For My name is within him, therefore I warn you not to rebel against him as if you were rebelling against Me, since My name is within him and he will not be able to pardon your transgression, for the rebellion depends on Me. An analogy is one who rebels against the word of the treasurer who does not have the power to pardon, for the rebellion depends on the king. Rashi explains that "My name is within him" refers to Metatron whose name is like his Master's name, for Metatron has the same numerical value as Shaddai. And a reminder of this is a computation in אתב"ש coding. And Rabbi Moshe says the reason I state about him that his name is like his Master's name is that his name is spelled out in the Aleph-Beta of Rabbi Akiva, and there it enumerates the 72 names that belong to him.