Kitâb at-Tawheed – Explained by Muhammad ibn ‘Abdul Wahhâb The most important subject for a Muslim to comprehend is Allah’s monotheism and the full implications of that belief, as without that, no act of worship or good deed is accepted by Allah, nor rewarded in the hereafter. Sameh Strauch has rendered one of the finest books on this subject into English, and he provides explanations of every major point.