Sahih Muslim
Sahih Muslim 1371b
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ النَّضْرِ بْنِ أَبِي النَّضْرِ، حَدَّثَنِي أَبُو النَّضْرِ، حَدَّثَنِي عُبَيْدُ اللَّهِ، الأَشْجَعِيُّ عَنْ سُفْيَانَ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ . مِثْلَهُ وَلَمْ يَقُلْ " يَوْمَ الْقِيَامَةِ " وَزَادَ " وَذِمَّةُ الْمُسْلِمِينَ وَاحِدَةٌ يَسْعَى بِهَا أَدْنَاهُمْ فَمَنْ أَخْفَرَ مُسْلِمًا فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ لاَ يُقْبَلُ مِنْهُ يَوْمَ الْقِيَامَةِ عَدْلٌ وَلاَ صَرْفٌ " .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
A similar hadith is transmitted from al-Amash through the same chain, but this version does not mention the Day of Resurrection. It adds: The protection granted by Muslims is one and is binding even when granted by the least among them. Whoever violates a Muslim protection agreement will incur the curse of Allah, the angels, and all people, and no obligatory or voluntary deed will be accepted from him on the Day of Resurrection.