Titles: Sahub-ul-Rasul
Another title of Hazrat Abu Bakr (ra) is “Sahib-ul-Rasul”, which means “the Companion of the Messenger (sa)”.
Hazrat Abu Bakr (ra) states that he once addressed a gathering and asked, “Who among you shall recite Surah al-Taubah?” One of them stated, “I will.” When he reached the verse:
إِذۡ يَقُولُ لِصٰحِبِهِۦ لَا تَحۡزَنۡ
That is, “When he said to his Companion, ‘Grieve not …’” [Ch.9: V.40], Hazrat Abu Bakr (ra) began to cry and said, “By God, I was that very companion of the Holy Prophet (sa).”
(Ali bin Burhan al-Din al-Halabi, Al-Sirah al-Halabiyyah, Vol. 2, Bab Ard Rasul Allahsa Nafsihi … [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2002], p. 54)