مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4311
Musnad of Abdullah bin Mas'ood
It was narrated from `Abdullah that The Prophet (ﷺ) came to him (walking) between Abu Bakr and ‘Umar (رضي الله عنهما) And he narrated a similar report.
Musnad Ahmad 4341Saheeh because of corroborating evidences]