Authentic
graded by Al-Albani
Mishkat al-Masabih 6259
Narrator:Umar ibn al-Khattāb
وَعَن جَابر قا ل: كَانَ عُمَرُ يَقُولُ: أَبُو بَكْرٍ سَيِّدُنَا وَأَعْتَقَ سَيِّدَنَا يَعْنِي بِلَالًا. رَوَاهُ البُخَارِيّ
Jabir told that `Umar used to say, "Abu Bakr is our chief, and he manumitted our chief," meaning Bilal. Bukhari transmitted it.
Cited in Mishkat al-Masabih (No. 6259).