Sahih Muslim
The Book of Faith (Kitab Al-Iman)
Book Number: 001 / Hadith Number: 167
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.