Sahih Muslim
The Book Giving Description of the Day of Judgement, Paradise and Hell (Kitab Sifat Al-Qiyamah wal Janna wan-Nar)
Book Number: 039 / Hadith Number: 6733
Anas b. Malik reported Allah's Messenger (may peace be upon him) as saying: Allah, the Exalted and High, would say to one who shall have to undergo the least torture (on the Day of Resurrection): Would you like to go as ransom if you had all worldly riches; he would say: Yes. Allah would say to him: When you were in the loins of Adam, I demadded from you something easier than this that you should not associate anything with Me. (The narrator says): I think He also said: I would not cause you to enter Hell-Fire but you defied and attributed Divinity (to others besides Me).