Hadithcore
Mishkat al-Masabih, 1127

Ibn ‘Umar said:

When the first Emigrants came to Medina, Salim the client of Abu Hudhaifa acted as their <i>imam</i>, and ‘Umar and Abu Salama b. ‘Abd al-Asad were among their number. Bukhari transmitted it.

وَعَنِ ابْنِ عُمَرَ قَالَ: لَمَّا قَدِمَ الْمُهَاجِرُونَ الْأَوَّلُونَ الْمَدِينَةَ كَانَ يَؤُمُّهُمْ سَالِمٌ مَوْلَى أَبِي حُذَيْفَةَ وَفِيهِمْ عُمَرُ وَأَبُو سَلَمَةَ بْنُ عَبْدِ الْأسد. رَوَاهُ البُخَارِيّ

References1 variant
In-Book Reference
Book 4, Hadith 544