Mishkat al-Masabih 4 Prayer كتاب الصلاة 544

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

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