This is the approved revision of this page, as well as being the most recent.
- It's a biblical mitzvah to lend to a Jew who is need of borrowing money  even if he is rich but doens't have the money right now. Additionally it's a greater mitzvah than giving tzedaka because the receiver isn't embarrassed. 
- There's a mitzvah to lend out objects that another Jew is in need of borrowing. 
- The measure for this mitzvah is each person according to their abilities. 
- Shemot 22:24
- Ahavat Chesed (authored by the Chafetz Chaim) 1:1
- Ahavat Chesed 1:2 explains that even though this doesn't fit into the category of the mitzvah to lend money but it certainly fulfills a mitzvah of chesed.
- Ahavat Chesed 1:4