Sahih Muslim Book 1, Hadith Number 167.

Chapter : He who dies associating none with Allah would enter Paradise and he who dies as a polytheist would enter the fire of Hell.

It is narrated on the authority of Abdullah b. Mas’ud that Waki told (him) that the Messenger of Allah had observed and Ibn Numair asserted: I heard the Messenger of Allah (may peace be upon him) saying: He who dies associating anything with Allah would enter the Fire (of Hell). ‘Abdullah b. Mas’ud said: I say that he who died without associating anything with Allah entered Paradise.