In the name of Allah, the Most Merciful, the Bestower of Mercy.

All praise is due to Allah—abundant, pure, and blessed praise. May Allah bestow ever-increasing blessings and peace upon His servant and Messenger, the last of His prophets and messengers, Muhammad, and upon his family and Companions. To proceed:

This book, “A Response on Faith and What Nullifies It,” was dictated by His Eminence Shaykh ‘Abd al-Rahmān al-Barrāk, may Allah preserve him. It offers a concise, focused clarification of matters concerning faith and what nullifies it, according to the doctrine of Ahl al-Sunnah wa-l-Jamā‘ah. Though modest in size, it is substantial in meaning.

It is now being reprinted in a new format, after its copies sold out and requests for it became frequent.

I have taken care to trace its hadiths to their sources and quote the scholars’ assessments of their authenticity or weakness, and to provide references wherever needed. I have also added a few brief comments, such as clarifying a meaning, citing evidence for a view, and offering other useful points.