We start with a verse from Vayikra (Leviticus) 25:37: "Your money you shall not give him on interest, and on increase you shall not give your food.” Simple enough. Except, as always, the devil's in the details, or rather, in the interpretation.

The Sifrei Devarim, a legal midrash on the Book of Deuteronomy, latches onto the words "your money" and "your food." It asks: does this mean the prohibition against charging interest applies only to your own money and your own food? Could you, theoretically, charge interest on money or food belonging to, say, a non-Jew?

It’s a fair question. The Sifrei then suggests an alternative interpretation. Maybe "your money" really means not money set aside for ma'aser, the tithe traditionally given to support the Levites and the poor. And "your food" might exclude food intended for your animals.

So, how do we figure out what the Torah really means?

The Sifrei cleverly uses a bit of textual jujitsu. It points to another verse, this time from Deuteronomy (Devarim, Ibid.), which speaks of "interest of money" and "interest of food." The Sifrei argues that the phrase "interest of money" is broad enough to include money set aside for ma'aser. Similarly, "interest of food" covers food intended for animals. This expansion shows us that the prohibition is broader than it initially seemed.

But it doesn't stop there! We still only know about money and food. What about other items? That's where the phrase “interest of anything that can be (construed as) interest” comes into play. This, the Sifrei argues, expands the prohibition to cover any kind of lending where interest is involved.

What’s really going on here? Why all this parsing of words?

Well, Jewish law isn't just a set of rules; it's a system of ethics. At its heart is a profound concern for the vulnerable. The prohibition against charging interest isn't just about economics; it's about preventing exploitation. It’s about creating a society where people help each other, not profit from each other's misfortune. This is the spirit that animates the legal reasoning we see in the Sifrei Devarim.

So, the next time you think about lending money, remember this little journey through the Sifrei. It’s a reminder that even seemingly simple commandments can hold profound ethical implications, and that even the smallest words can open up a world of meaning. It's not just about the letter of the law, but the spirit behind it.