Muwatta Malik, Book 16, Hadith 531 (In-Book)

Yahya related to me from Muhammad ibn alMunkadir that Rabia ibn Abdullah ibn alHadir told him that he had seen Umar ibn al-Khattab leading people in front of the bier at the funeral of Zaynab bint Jahsh.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ رِبِيعَةَ بْنِ عَبْدِ اللَّهِ بْنِ الْهَدِيرِ، أَنَّهُ أَخْبَرَهُ أَنَّهُ، رَأَى عُمَرَ بْنَ الْخَطَّابِ يَقْدُمُ النَّاسَ أَمَامَ الْجَنَازَةِ فِي جَنَازَةِ زَيْنَبَ بِنْتِ جَحْشٍ ‏.‏

sunnah.com

also referenced under: Book 16, Hadith 9 (USC-MSA)