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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:4023 – Muḥammad b. Qudāmah > Jarīr > Zayd b. ʿAṭāʾ b. al-Sāʾib > Ziyād b. ʿIlāqah > Usāmah b. Sharīk

"The Messenger of Allah [SAW] said: 'Any man who goes out and tries to create division among my Ummah, strike his neck (kill him).'"  

النسائي:٤٠٢٣ – أَخْبَرَنَا مُحَمَّدُ بْنُ قُدَامَةَ قَالَ حَدَّثَنَا جَرِيرٌ عَنْ زَيْدِ بْنِ عَطَاءِ بْنِ السَّائِبِ عَنْ زِيَادِ بْنِ عِلاَقَةَ عَنْ أُسَامَةَ بْنِ شَرِيكٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ أَيُّمَا رَجُلٍ خَرَجَ يُفَرِّقُ بَيْنَ أُمَّتِي فَاضْرِبُوا عُنُقَهُ  

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:3472 – Muḥammad b. Qudāmah al-Miṣṣīṣī > Jarīr > Zayd b. ʿAṭāʾ b. al-Sāʾib > Ziyād b. ʿIlāqah > Usāmah b. Sharīk

"The Messenger of Allah [SAW] said: 'Any man who goes out and tries to create division among my Ummah, strike his neck (kill him).'" (Using translation from Nasāʾī 4023)   

الكبرى للنسائي:٣٤٧٢ – أَخْبَرَنَا مُحَمَّدُ بْنُ قُدَامَةَ الْمِصِّيصِيُّ قَالَ حَدَّثَنَا جَرِيرٌ عَنْ زَيْدِ بْنِ عَطَاءِ بْنِ السَّائِبِ عَنْ زِيَادِ بْنِ عِلَاقَةَ عَنْ أُسَامَةَ بْنِ شَرِيكٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «أَيُّمَا رَجُلٍ خَرَجَ يُفَرِّقُ بَيْنَ أُمَّتِي فَاضْرِبُوهُ بِالسَّيْفِ»  

suyuti:9419a –
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السيوطي:٩٤١٩a –

"أيُّمَا رَجُلٍ خَرَجَ يُفَرِّقُ بين أمَّتِي وَهُمْ جَمِيعٌ فَاضْرِبُوا عنقَهُ".  

[ن] النسائي [طب] الطبرانى في الكبير وأبو نعيم في المعرفة عن أسامة بن شريك