משנה תורה
Mishneh Torah (Rambam)
The Rambam's code of all of halacha, in 14 books
קיצור שולחן ערוך
Kitzur Shulchan Aruch
The everyday halacha handbook of Rabbi Shlomo Ganzfried
ספר החינוך
Sefer HaChinuch
All 613 mitzvos, in the order of the Torah, with their reasons
תניא
Tanya
The Alter Rebbe of Chabad, Rabbi Schneur Zalman of Liadi
מסילת ישרים
Mesillat Yesharim
The Path of the Just, by the Ramchal
דרך ה'
Derech Hashem (Ramchal)
The Way of Hashem: the foundations of emunah, by the Ramchal
חובות הלבבות
Duties of the Heart (Chovot HaLevavot)
Duties of the Heart, by Rabbeinu Bachya ibn Pakuda
שערי תשובה
Shaarei Teshuvah (Rabbeinu Yonah)
The Gates of Repentance, by Rabbeinu Yonah of Gerona
אורחות צדיקים
Orchot Tzadikim
The Ways of the Righteous: middos, gate by gate
חפץ חיים
Chofetz Chaim
The laws of proper speech, by the Chofetz Chaim
שמירת הלשון
Shemirat HaLashon
Guarding the Tongue: the Chofetz Chaim on why proper speech matters
נפש החיים
Nefesh HaChaim
Rabbi Chaim of Volozhin on Torah, tefillah and the soul
הכוזרי
The Kuzari
Rabbi Yehuda HaLevi: the King of the Khazars learns why Judaism is true
מִשְׁנָה
Mishnah
All 63 masechtos, with nekudos, Hebrew and English
גְּמָרָא
Gemara
Bavli with Steinsaltz, Yerushalmi, the classic page
תַּנַ"ךְ
Chumash & Tanach
With Onkelos and Rashi
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