Sunan Ibn Majah, Volume 3, Book 21, Hadith 2684 (DarusSalam) ⓘ
It was narrated from Ma'qil bin Yasar that the Messenger of Allah said: “The Muslims are one hand against others, and their blood is equal.”
حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعِيدٍ الْجَوْهَرِيُّ، حَدَّثَنَا أَنَسُ بْنُ عِيَاضٍ أَبُو ضَمْرَةَ، عَنْ عَبْدِ السَّلاَمِ بْنِ أَبِي الْجَنُوبِ، عَنِ الْحَسَنِ، عَنْ مَعْقِلِ بْنِ يَسَارٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْمُسْلِمُونَ يَدٌ عَلَى مَنْ سِوَاهُمْ وَتَتَكَافَأُ دِمَاؤُهُمْ " .
also referenced under: Hadith 2684 (Reference) & Book 21, Hadith 2786 (In-Book)