Fath Al-Bari Sharh Sahih Al-Bukhari by Al-Hafiz Ahmad ibn Ali ibn Hajar Al-Asqalani, in two extra-large Arabic volumes — universally regarded as the greatest commentary ever written on a hadith collection. Arabic only. فتح الباري شرح صحيح البخاري للحافظ ابن حجر العسقلاني، في مجلدين كبيرين جدًّا.

لا تحزن- د.عائض القرني is an absolute must-read for all people. It is full of practical advice on how to replace sadness with a pragmatic and ultimately satisfying Islamic outlook on life.

Al-Mu'jam Al-Mufahras li-Alfaz Al-Qur'an Al-Kareem — the standard concordance of Qur'anic vocabulary. Every word listed by root, with every verse in which it occurs. The single most-used research tool in Qur'anic study. Arabic only. المعجم المفهرس لألفاظ القرآن الكريم: كل كلمة مرتبة على جذرها مع مواضعها من الآيات.

Aqdiyat Rasulillah ﷺ in two Arabic volumes — the judicial decisions of the Prophet ﷺ: the disputes brought before him, the judgments he issued, and the legal principles those judgments establish. Arabic only. أقضية رسول الله صلى الله عليه وسلم في مجلدين: القضايا التي رُفعت إليه والأحكام التي قضى بها.

Tafsir Al-Jalalayn in a medium Arabic edition with notes by Shaykh Safi-ur-Rahman Al-Mubarakpuri — the classic concise tafsir of the two Jalals, in a size suited to personal reading and carrying alongside a mushaf. تفسير الجلالين بطبعة عربية متوسطة، مع تعليق الشيخ صفي الرحمن المباركفوري.

The complete مسند الإمام أحمد بن حنبل in a single Arabic volume — approximately 27,000 hadith, arranged not by subject but by the Companion who narrated them, beginning with the ten promised Paradise. Arabic only. مسند الإمام أحمد بن حنبل كاملًا في مجلد واحد، نحو ٢٧٠٠٠ حديث مرتبة على الصحابة.

Al-Farooq — Sirat Umar ibn Al-Khattab by Allamah Shibli Nu'mani — the classic biography of the second Caliph, covering his life, his caliphate, his administration and the justice for which he is still the standard. Arabic only. الفاروق: سيرة عمر بن الخطاب رضي الله عنه للعلامة شبلي النعماني.

Rawdat Al-Anwar fi Sirat An-Nabi Al-Mukhtar — The Gardens of Lights — by Shaykh Safi-ur-Rahman Al-Mubarakpuri, author of Ar-Raheeq Al-Makhtum. A shorter Arabic Seerah in a single readable volume. Arabic only. روضة الأنوار في سيرة النبي المختار للشيخ صفي الرحمن المباركفوري.

Mawsu'at Al-Hadith — Al-Kutub As-Sittah: all six canonical collections in a single Arabic volume — صحيح البخاري، صحيح مسلم، سنن أبي داود، جامع الترمذي، سنن ابن ماجه، سنن النسائي. Arabic only. موسوعة الحديث — الكتب الستة كاملة في مجلد واحد.

Mukhtasar Zad Al-Ma'ad — the abridgement by Shaykh Muhammad ibn Abdul-Wahhab of Ibn Al-Qayyim's Zad Al-Ma'ad fi Hadyi Khayr Al-'Ibad. The Prophet's ﷺ guidance in worship, conduct and daily dealings, in one Arabic volume. مختصر زاد المعاد للإمام محمد بن عبد الوهاب، اختصار لكتاب ابن قيم.

Al-Alaqat Al-Ijtima'iyyah fil-Qur'an by Shaykh Abdullah Al-Hamad Al-Jalali — a study of social relationships as the Qur'an sets them out: ties between a person and family, neighbors, community and society, and the obligations attached. Arabic only. العلاقات الاجتماعية في القرآن للشيخ عبد الله الحمد الجلالي.

Mukhtasar Sirat Ar-Rasul ﷺ by Imam Muhammad ibn Abdul-Wahhab At-Tamimi — his abridged biography of the Prophet ﷺ, compiled by an appointed committee from printed, handwritten and microfilm sources gathered across the Muslim world. Large Arabic volume. مختصر سيرة الرسول صلى الله عليه وسلم للإمام محمد بن عبد الوهاب، مجلد كبير.

Kashf An-Niqab an Al-Asma wal-Alqab — Hafiz Jamal ad-Din Ibn Al-Jawzi's (d. 597 AH) two-volume work on the names, titles and epithets found throughout Islamic scholarship. About 660 pages, Arabic only. كشف النقاب عن الأسماء والألقاب للحافظ ابن الجوزي، مجلدان.

Sharh Al-Aqidah Al-Wasitiyyah — Shaykh Salih Al-Fawzan's simplified Arabic commentary on Ibn Taymiyyah's creed treatise, covering monotheism, Allah's Names and Attributes, the Messengers, the Last Day and divine decree. شرح العقيدة الواسطية للشيخ صالح الفوزان، شرح ميسّر لمتن شيخ الإسلام ابن تيمية.

Tafsir Al-Qur'an Al-Azim by Al-Hafiz Ibn Kathir in a deluxe four-volume Arabic set — the most widely relied upon tafsir among Ahlus Sunnah, explaining Qur'an by Qur'an, then Sunnah, then the words of the Companions and Salaf. تفسير القرآن العظيم للحافظ ابن كثير في أربعة مجلدات فاخرة، بطباعة واضحة.

Al-Ba'ith Al-Hathith Sharh Ikhtisar Ulum Al-Hadith — Ahmad Muhammad Shakir's commentary on Ibn Kathir's abridgement of Ibn As-Salah's classic on hadith sciences. 239-page Arabic hardcover. الباعث الحثيث شرح اختصار علوم الحديث، تعليق الشيخ أحمد محمد شاكر.