Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:23395a
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السيوطي:٢٣٣٩٥a

"مَنْ نَصَرَ قَوْمَهُ عَلَى غَيرِ الحَقِّ فَهُوَ كَالبَعِيرِ الَّذِي رُدِّي فَهُوَ يُنْزعُ بِذَنَبِهِ".  

[د] أبو داود (*) عن ابن مسعود

See similar narrations below:

Collected by Abū Dāwūd, Suyūṭī
abudawud:5117al-Nufaylī > Zuhayr > Simāk b. Ḥarb > ʿAbd al-Raḥman b. ʿAbdullāh b. Masʿūd from his father

If anyone helps his people in an unrighteous cause, he is like a camel which falls into a well and is pulled out by its tail.  

أبو داود:٥١١٧حَدَّثَنَا النُّفَيْلِيُّ حَدَّثَنَا زُهَيْرٌ حَدَّثَنَا سِمَاكُ بْنُ حَرْبٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ عَنْ أَبِيهِ قَالَ

مَنْ نَصَرَ قَوْمَهُ عَلَى غَيْرِ الْحَقِّ فَهُوَ كَالْبَعِيرِ الَّذِي رُدِّيَ فَهُوَ يُنْزَعُ بِذَنَبِهِ