What are the connotations of the words "Kol ha'Mitzvah"?
Rashi #1: It means literally 'all the Mitzvos'. 1
Rashi #2 (citing a Midrash): It implies that someone who begins to perform a Mitzvah should complete it. 2
Ramban: Even though Hashem had commanded Yisrael to observe the Mishpatim, 3 they should take care to observe all the Mitzvos, because it is as a result of keeping all the Mitzvos that they will merit living in the land and to flourish with regard to the fruit of the womb, the fruit of the animals and the fruit of the land.
See Sifsei Chachamim.
Rashi: Because a Mitzvah is ascribed to the person who concludes it, like we find in Yehoshua, 24:32, where the Pasuk records how Yisrael buried the bones of Yosef in Sh'chem, in spite of the fact that Moshe was the one to take them out of Egypt and transport them through the desert for forty years. Da'as Zekenim
What life and increase is the Pasuk discussing?
Ramban: It is discussing life in this world, and increase of children, animals and fruit.
Rosh #1: It is life in the world to come, and increase of children and money.
Rosh #2: It is life in the days of Mashi'ach, and increase of stature.