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:2-194bʿUmar
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السيوطي:٢-١٩٤b

"عَنْ عُمَرَ أَنَّ النَّبِىَّ ﷺ كَبَّرَ عَلَى النَّجاشَىِّ أرْبعًا".  

[قط] الدارقطنى في السنن في الأفراد، والمحاملى في أماليه

See similar narrations below:

Collected by Ibn Mājah, Aḥmad
ibnmajah:1538Sahl b. Abū Sahl > Makkī b. Ibrāhīm Abū al-Sakan > Mālik > Nāfiʿ > Ibn ʿUmar

It was narrated from Ibn ‘Umar that the Prophet ﷺ offered the funeral prayer for Najashi and said four Takbir.  

ابن ماجة:١٥٣٨حَدَّثَنَا سَهْلُ بْنُ أَبِي سَهْلٍ حَدَّثَنَا مَكِّيُّ بْنُ إِبْرَاهِيمَ أَبُو السَّكَنِ عَنْ مَالِكٍ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ صَلَّى عَلَى النَّجَاشِيِّ فَكَبَّرَ أَرْبَعًا  

ahmad:7147Ismāʿīl b. Ibrāhīm > Maʿmar > al-Zuhrī > Saʿīd b. al-Musayyibiʿan Abū Hurayrah

It was narrated from Ibn ‘Umar that the Prophet ﷺ offered the funeral prayer for Najashi and said four Takbir. (Using translation from Ibn Mājah 1538)   

أحمد:٧١٤٧حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ حَدَّثَنَا مَعْمَرٌ عَنِ الزُّهْرِيِّ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِعَنْ أَبِي هُرَيْرَةَ

أَنَّ رَسُولَ اللهِ ﷺ صَلَّى عَلَى النَّجَاشِيِّ فَكَبَّرَ أَرْبَعًا