Sahih Muslim Book - 35, Hadith - 5125

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ سُلَيْمَانُ بْنُ حَيَّانَ ، عَنْ مَنْصُورِ بْنِ حَيَّانَ ، عَنْ أَبِي الطُّفَيْلِ ، قَالَ: قُلْنَا لِعَلِيِّ بْنِ أَبِي طَالِبٍ ، أَخْبِرْنَا بِشَيْءٍ أَسَرَّهُ إِلَيْكَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، فَقَالَ: مَا أَسَرَّ إِلَيَّ شَيْئًا كَتَمَهُ النَّاسَ ، وَلَكِنِّي سَمِعْتُهُ يَقُولُ: لَعَنَ اللَّهُ مَنْ ذَبَحَ لِغَيْرِ اللهِ ، وَلَعَنَ اللَّهُ مَنْ آوَى مُحْدِثًا ، وَلَعَنَ اللَّهُ مَنْ لَعَنَ وَالِدَيْهِ ، وَلَعَنَ اللَّهُ مَنْ غَيَّرَ الْمَنَارَ.

It was narrated that Abu At-Tufail said: "We said to 'Ali bin Abi Talib: 'Tell us of something that the Messenger of Allah (s.a.w) told you in secret.' He said: 'He did not tell me anything in secret that he concealed from the people, but I heard him say: "May Allah curse the one who offers a sacrifice to something other than Allah, may Allah curse the one who gives refuge to a Muhdith, may Allah curse the one who curses his parents and may Allah curse the one who changes the boundary markers."