The Rebbe says:
1. The first words of this week’s Torah portion are, “And it shall be, because you listened to these ordinances of Hashem (G-d)… He will love you, bless you and multiply you…”.
Rashi (an acronym for Reb Shlomo Yitzchaki) points out that the Hebrew word “Eikev” which is simply translated in this verse as “because”, also means “heel”. Consequently, explains Rashi, the verse is alluding to the sort of Mitzvos (commandments) that people regard as relatively unimportant so they tend to “trample on them with their heels”. Thus, the Torah is assuring the Jewish people that if they are careful to observe even these neglected commandments, they can be certain that Hashem will reward them with His kindness.
The source of Rashi’s explanation is from the Midrash Tanchuma who says this in a slightly different way; “When the Torah says, ‘Eikev’”, says the Midrash Tanchuma, “it is referring to “light” Mitzvos which people are not careful to keep and they throw them away under their heels”.