(4) Prayer
كتاب الصلاة
(27c) Chapter: The Office of Imam - Section 3
(26) باب الإمامة - الفصل الثالث
Mishkat al-Masabih 1127 
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.
وَعَنِ ابْنِ عُمَرَ قَالَ: لَمَّا قَدِمَ الْمُهَاجِرُونَ الْأَوَّلُونَ الْمَدِينَةَ كَانَ يَؤُمُّهُمْ سَالِمٌ مَوْلَى أَبِي حُذَيْفَةَ وَفِيهِمْ عُمَرُ وَأَبُو سَلَمَةَ بْنُ عَبْدِ الْأسد. رَوَاهُ البُخَارِيّ
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 1127
In-book reference : Book 4, Hadith 544