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muslim:734 – Abū Bakr b. Abū Shaybah > ʿUbaydullāh b. Mūsá > Ḥasan b. Ṣāliḥ > Simāk > Jābir b. Samurah

Jabir b. Samura reported that the Messenger of Allah ﷺ observed (Nafl) prayer sitting before his death.  

مسلم:٧٣٤ – وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى عَنْ حَسَنِ بْنِ صَالِحٍ عَنْ سِمَاكٍ قَالَ أَخْبَرَنِي جَابِرُ بْنُ سَمُرَةَ

أَنَّ النَّبِيَّ ﷺ لَمْ يَمُتْ حَتَّى صَلَّى قَاعِدًا  

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:2008 – al-Ḥusayn b. Isḥāq al-Tustarī > ʿUthmān b. Abū Shaybah > ʿUbaydullāh b. Mūsá > Ḥasan b. Ṣāliḥ > Simāk b. Ḥarb > Jābir b. Samurah

[Machine] The Prophet ﷺ did not pass away until he had performed the prayer sitting.  

الطبراني:٢٠٠٨ – حَدَّثَنَا الْحُسَيْنُ بْنُ إِسْحَاقَ التُّسْتَرِيُّ ثنا عُثْمَانُ بْنُ أَبِي شَيْبَةَ ثنا عُبَيْدُ اللهِ بْنُ مُوسَى ثنا حَسَنُ بْنُ صَالِحٍ عَنْ سِمَاكِ بْنِ حَرْبٍ عَنْ جَابِرِ بْنِ سَمُرَةَ قَالَ

«مَا مَاتَ رَسُولُ اللهِ ﷺ حَتَّى صَلَّى قَاعِدًا»