Sahih al-Bukhari 1949
Narrated Nafi`:
Ibn `Umar recited the verse: "They had a choice either to fast or to feed a poor person for every day, 
and said that the order of this Verse was canceled.
حَدَّثَنَا عَيَّاشٌ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَرَأَ فِدْيَةٌ طَعَامُ مَسَاكِينَ‏.‏ قَالَ هِيَ مَنْسُوخَةٌ‏.‏