Sahih Bukhari Volume 8, Book 81, Hadith 6559

حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي عِمْرَانَ، قَالَ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ يَقُولُ اللَّهُ تَعَالَى لأَهْوَنِ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ لَوْ أَنَّ لَكَ مَا فِي الأَرْضِ مِنْ شَىْءٍ أَكُنْتَ تَفْتَدِي بِهِ فَيَقُولُ نَعَمْ‏.‏ فَيَقُولُ أَرَدْتُ مِنْكَ أَهْوَنَ مِنْ هَذَا وَأَنْتَ فِي صُلْبِ آدَمَ أَنْ لاَ تُشْرِكَ بِي شَيْئًا فَأَبَيْتَ إِلاَّ أَنْ تُشْرِكَ بِي ‏"‏‏.‏

Narrated By Anas bin Malik : The Prophet said, "Allah will say to the person who will have the minimum punishment in the Fire on the Day of Resurrection, 'If you had things equal to whatever is on the earth, would you ransom yourself (from the punishment) with it?' He will reply, Yes. Allah will say, 'I asked you a much easier thing than this while you were in the backbone of Adam, that is, not to worship others besides Me, but you refused and insisted to worship others besides Me.'"