معتقد فرق المسلمين و اليهود و النصارى و الفلاسفة و الوثنيين في الملائكة المقربين
للشيخ محمد بن عبد الوهاب العقيل
Very good book about faith in angels, the second pillar of faith in Islam.
In this book Shaykh Muhammad Al-'Aqil explains everything that relates to faith in angels: their names, their numbers, their work, what they are created, their attributes, their behavior, their worship, their rights, benefits of faith in angels...
He also reminds us of the misguided belief of Muslim groups, Christians, Jews, philosophers, Buddhists, polytheists and many other groups about the angels.