They either likened Allah with His creation or twisted His Names or turned to else than Him. Through Muhammmad (p.b.u.h.a.h.p.) Allah guided them out of wrong and with his efforts took them out of ignorance. 
Then Allah chose for Muhammmad, peace be upon him and on his progeny, to meet Him, selected him for His own nearness, regarded him too dignified to remain in this world and decided to remove him from this place of trial.
So He drew him towards Himself with honour. Allah may shower His blessing on him, and his progeny.  
The Holy Qur'an and Sunnah 
But the Prophet left among you the same which other Prophets left among their peoples, because Prophets do not leave them untended (in dark) without a clear path and a standing ensign, namely the Book of your Creator clarifying its permission and prohibitions, its obligations and discretion, its repealing injunctions and the repealed ones, its permissible matters and compulsory ones, its particulars and the general ones, its lessons and illustrations, its long and the short ones, its clear and obscure ones, detailing its abbreviations and clarifying its obscurities.