Angels & demons in islam

Angels are mentioned often in the Qur'an and Hadith. Islam is clear about the nature of angels saying they are messengers of God. That Angels have no free will, and can only do what God orders them to do. An example of a task they may carry out is that of testing of individuals by granting them abundant wealth and curing their illness. Believing in angels is one of the six Articles of Faith in Islam. The Qur'an also mentions angels who God has chosen to punish the sinful in hell, these angels take no pity on punishing them as they do what the Lord has commanded them to precisely and perfectly. A verse stipulates this: "O ye who believe! Save yourselves and your families from a Fire whose fuel is Men and Stones, over which are (appointed) angels stern (and) severe, who flinch not (from executing) the Commands they receive from Allah, but do (precisely) what they are commanded." - Qur'an, sura 66 (At-Tahrim) ayah 6 This book takes a serious look at angels and demons in the religion of Islam. Did you know that 19 demons guard hell?  A thoroughly interesting read that will keep your attention.