Why does the Torah insert the (otherwise superfluous) word "Kol Choli"?
Ramban and Seforno: To incorporate even illnesses that come through natural causes 1 - which require more protection to avoid.
Bava Metzi'a, 107b: Amora'im list five things that "Kol Choli" comes to include 2 : 1. 'Ayin ha'Ra'; 2. tempestuous winds; 3. extreme cold; 4. excessive mucus and wax in the ears; 5. depression (or anger) 3 - that will not effect us.
Yerushalmi Shabbos, 14:3: Tana'im list thre things that "Kol Choli" comes to include 4 : 1. high fever; 5 2. overcome by gloomy thoughts; 6 3. a powerful Yeitzer ha'Ra 7 - that will effect our enemies but not us.
Ba'al haTurim: It refers to the ninety-eight K'lalos in Ki Savo - the Gematriya of "Kol Choli" which Hashem will remove.
What is the definition of "Madvei Mitzrayim ha'Ra'im"?
Seforno: It means 'contagious maladies'.
Why does the Torah mention "Madvei Mitzrayim ha'Ra'im"?
Ramban #1: To teach us that Hashem will place all those maladies on our enemies, just as He placed them on the Egyptians.
Ramban #2: To insinuate that if we don't observe the Mishpatim, He will place them on us. 1
Ramban: As the Pasuk writes in Bechukosai Bamidbar, 28:9.
What is "asher Yada'ata" referring to?
Seforno: It refers to the maladies with which the Egyptians were stricken by the Yam-Suf. 1
Why does the Torah add the phrase "u'Nesanam be'Chol Son'echa"? Why does the Torah insert it together with the B'rachos of Yisrael?
Seforno: To magnify the miracle - in that even though Hashem will bring the contagious illnesses and plagues on our enemies, they will not affect us. 1
Oznayim la'Torah: Because that would leave them no time to scheme against Yisrael. 2
Seforno: In keeping with the Pasuk in Tehilim, 91:7 (and as occurred by the ten plagues in Egypt). Refer also to 7:15:2:1.
See Eichah, 3:63.
