Hadithcore
Bulugh al-Maram, 570

Salim narrated on the authority of his father (RAA) that he saw the Messenger of Allah (ﷺ), Abu Bakr and ’Umar walking in front of a Funeral.’ Related by the five Imams, and Ibn Hibban rendered it Sahih.

وَعَنْ سَالِمٍ, عَنْ أَبِيهِ ‏- رضى الله عنه ‏- { أَنَّهُ رَأَى اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-وَأَبَا بَكْرٍ وَعُمَرَ, يَمْشُونَ أَمَامَ الْجَنَازَةِ } رَوَاهُ اَلْخَمْسَةُ، وَصَحَّحَهُ ابْنُ حِبَّانَ, وَأَعَلَّهُ النَّسَائِيُّ وَطَائِفَةٌ بِالْإِرْسَالِ [1]‏ .‏

References2 variants
In-Book Reference
Book 3, Hadith 39
English Reference
Book 3, Hadith 595