Halakhah su Salmi 111:3

It is also a mitzvah for every person to buy other sacred books for learning purposes, such as Tenach (Bible), the Mishnah, the Talmud, and codes of law, to study from them and to lend them to others. If a person does not have the means to buy both a Seifer Torah and other books for study, then the books for study have preference. Our Rabbis of blessed memory stated: ["It is written], "And his righteousness endures forever,"²Psalms 111:3. this refers to the person who writes (or buys) [sacred] books and lends them to others."³Kesuvos 50a.