" He who violated the covenant with a Muslim, there is upon him the curse of Allah, of angels and of all people. Neither an obligatory act nor a supererogatory act would be accepted from him as recompense on the Day of Resurrection; and in the hadith transmitted by two other narrators these words are not found:" He who claimed false paternity." And in the hadith transmitted by Waki' there is no mention of the Day of Resurrection.  

عَنِ الأَعْمَشِ بِهَذَا الإِسْنَادِ نَحْوَ حَدِيثِ أَبِي كُرَيْبٍ عَنْ أَبِي مُعَاوِيَةَ إِلَى آخِرِهِ وَزَادَ فِي الْحَدِيثِ فَمَنْ أَخْفَرَ مُسْلِمًا فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ لاَ يُقْبَلُ مِنْهُ يَوْمَ الْقِيَامَةِ صَرْفٌ وَلاَ عَدْلٌ وَلَيْسَ فِي حَدِيثِهِمَا مَنِ ادَّعَى إِلَى غَيْرِ أَبِيهِ وَلَيْسَ فِي رِوَايَةِ وَكِيعٍ ذِكْرُ يَوْمِ الْقِيَامَةِ  

Medina is a sacred territory, so he who made any innovation in it. or gave protection to an innovator, there is upon him the curse of Allah, that of the angels and that of all the people. There would not be accepted on the Day of Resurrection either obligatory acts or supererogatory acts from him.  

عَنِ النَّبِيِّ ﷺ قَالَ الْمَدِينَةُ حَرَمٌ فَمَنْ أَحْدَثَ فِيهَا حَدَثًا أَوْ آوَى مُحْدِثًا فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ لاَ يُقْبَلُ مِنْهُ يَوْمَ الْقِيَامَةِ عَدْلٌ وَلاَ صَرْفٌ  

Medina is a sacred territory, so he who made any innovation in it. or gave protection to an innovator, there is upon him the curse of Allah, that of the angels and that of all the people. There would not be accepted on the Day of Resurrection either obligatory acts or supererogatory acts from him. (Using translation from Muslim 1371a)  

قَالَ رَسُولُ اللهِ ﷺ الْمَدِينَةُ حَرَمٌ فَمَنْ أَحْدَثَ فِيهَا حَدَثًا أَوْ آوَى مُحْدِثًا فَعَلَيْهِ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ لَا يَقْبَلُ اللهُ مِنْهُ يَوْمَ الْقِيَامَةِ عَدْلًا وَلَا صَرْفًا  

[Machine] The Messenger of Allah ﷺ said: The protection of Muslims is one, which is sought by the least among them. So whoever harms a Muslim, upon him is the curse of Allah, the angels, and all people. Allah does not accept any expiation or compensation from him.  

قَالَ رَسُولُ اللهِ ﷺ ذِمَّةُ الْمُسْلِمِينَ وَاحِدَةٌ يَسْعَى بِهَا أَدْنَاهُمْ فَمَنْ أَخْفَرَ مُسْلِمًا فَعَلَيْهِ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ لَا يَقْبَلُ اللهُ ﷻ مِنْهُ صَرْفًا وَلَا عَدْلًا  

"ذِمَّةُ الْمُسْلِمِينَ وَاحِدَةٌ يَسْعَى بهَا أَدْنَاهُم، فَمَنْ أَخْفَرَ مُؤْمِنًا فَعَلَيْهِ لَعَنَةُ اللَّهِ، والملائكةِ، والنَّاسِ أَجْمَعِينَ، لا يُقبَل منه يومَ القيامة صرفٌ ولا عدلٌ".