What is the connection between this Pasuk and the previous one?
Seforno: The nicest way of supporting a needy person is by extending him a free-interest loan.
Refer to 25:36:5:1.
What is the difference between "Neshech" and "Tarbis"?
Rashi: In fact, the Chachamim equate them, and the Torah gives them two names to make them two La'avin.
Ramban and Moshav Zekenim: According to the simple meaning "Neshech" 1 is interest that increases every year (compound interest), whereas Tarbis is lending on condition to pay back with an addition, which does not depend on when one repays. 2
Bava Metzi'a, 60b: "Neshech" is somone who lends a Sela for five Dinrim ot two Sa'ah of wheat for three; Tarbis is where he inreases his stock of fruit by means of a deal. 3
Ramban: So-called because the interest grows into a large amount - like the blown-up swelling of a snake-bite. This is customary with a monetary loan. See Ba'al ha'Turim.
Ramban: As one tends to do with fruit, where Reuven lends Shimon a measure of food until the harvest, when Shimon repays a little extra.
See Torah Temimah, note 190.
What are the implication of the word "Al Tikach me'Ito Neshech"?
Bava Kama, 112a: It precludes the heirs from having to return the Ribis that their father took from the debtor. 2
Bava Metzi'a, 71a: The entire phrase implies that one may not take from him Ribis but that one may undertake to be a guarantor for him against a loan that he makes from a Nochri. 3
Why does the Torah insert the words "ve'Yareisa me'Elokecha"?
Rashi: Because a person is drawn after interest, and it is difficult to break away from it. Moreover, one allows oneself the liberty of taking interest to offset the loss of his money. 1
Rashi: It is a warning against lending money on interest claiming that it belongs to a Nochri. 2 Only Hashem knows the true facts. Therefore the Torah writes "ve'Yareisa me'Elokecha".
What are the ramifications of the phrase "ve'Chei Achicha Imach"?
Rashi (in Kesuvos, 15b) and Targum Onkelos: It is a Mitzvah to sustain one's fellow-Jew. 1
Ramban #2 (citing Bava Metzi'a, 62a): It implies an obligation to return a fixed Ribis 4 to the borrower, to enable him to live.
Seforno: It implies that one is only obligated to lend a needy person money if, after extending the loan, one has enough to live on oneself. 5
It is a reason for the prohibition against taking interest - because he is your brother and you would not lend your brother money on interest (EC).
Bava Metzi'a: This only pertains to human-beings however "Achicha", 've'Lo Shor'
Why did the Torah write "va'Chai Imach" in Pasuk 35 and "ve'Chei Achicha Imach" here?
Ha'amek Davar: Because whereas in Pasuk 35, "va'Chai" was referring to enablong the poor man to live, here the Torah is saying 'Lend the Ani without interest so that your brother will be able to live on a standard that is on a par with your own!'
QUESTIONS ON RASHI
Rashi writes that one may not lend money on interest claiming that it is a Nochri's. Even if it is a Nochri's it is forbidden, since Shelichus does not apply to Nochrim (it is as if the Jew lends)!
Riva: If Reuven tells Shimon 'Take this security and borrow from a Nochri with Ribis', it is permitted, since Shimon has no liability to the Nochri; he is Reuven's Shali'ach. Or, if a Nochri deposited coins with Shimon, and he has no responsibility for them, the Yerushalmi says that he may lend them with Ribis. This fits better into Rashi's words.