Sefer Ha’mitzvos Ha’Katzar (The concise book of mitzvos) By the Chofetz Chaim
This book lists the Torah mitzvos that can be observed today
Second Section – the Negative Commandments
55. It is a negative commandment “do not borrow money at interest from a Jew”
As it states in Devarim (Deuteronomy) 23:20, “You shall not give interest to your brother.” This is a warning to the borrower. The borrower that transgresses this also transgresses the negative commandment in Vayikra (Leviticus) 19:14, “Do not place a stumbling block before a blind man.”
This applies in all places and at all times, for men and for women.
4. Be kind to yourself. Speaking badly even about yourself is unethical.
הלכות שמירת הלשון 