From Sahih Muslim (Hadith 7085):
Anas b. Malik reported that Allah's Messenger (may peace be u n him) said:It would be said to the non-believers on the Day of Resurrection: If you were to possess gold, filling the whole earth, would you like to secure your freedom by paying that? He would say: Yes. Thereupon it would be said to him: Something easier (than this) was demanded from you (but you paid no heed to it)
Reference: Muslim 7085