This book gives a clear explanation of the Muslim sound Creed which is the core of the religion of Islam, as the belief in Tawhid (monotheism) is the purpose for which Allah created both mankind and jinn, and thus, those whoes belief in Tawhid is corrupt, are not considered Muslims.
Author: Saleh Bin Fawzaan al-Fawzaan
This booklet explains the basic rights of Hajj. It also notes that the tawheed of Allah requires the Muslim to follow the perfect way of worship, demonstrated by Muhammad (peace and blessings be upon him) and as understood by the Sahaabah who were the best of mankind.
Publisher: http://www.al-jumuah.com - Al-Jumuah Magazine Website
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Author: Muhammad Bin Ali Al-Arfaj
Publisher: http://www.dar-alsalam.com - Darussalam Publications Website
A detailed description of the different ways the Prophet (s) advised people.
Author: Muhammad Salih Al-Munajjid
Publisher: Islamic Propagation Office in Rabwah
Source: http://www.islamhouse.com/p/1359
Issues that the caller to Allah must obtain
Author: Muhammad ibn Saleh al-Othaimeen
Brief lessons in fiqh, da'wah (calling to Islam), Creed and hadeeth and its terminologies taught in the Educational Department of Islamhouse. They help Muslims to be aware of what he indeed needs regarding the Islamic sciences. They also give him a glimpse of qualities of the caller to Islam.
Publisher: Islamic Propagation Office in Rabwah