Al-Matalib al-'Aliyah 4076 — The merits of Abu Dharr

It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him) that he said: "I was the fourth of the first four people to accept Islam, that is, only three people had believed before me and I was the fourth Muslim. Then I came to the noble presence of the Prophet (peace and blessings be upon him) and said: 'Peace be upon you, O Prophet of Allah. I bear witness that there is no god worthy of worship except Allah, alone, without any partner, and I bear witness that Muhammad is His servant and His Messenger.'" Sayyiduna Abu Dharr (may Allah be pleased with him) says: "When I uttered these words, I saw signs of joy and delight on the radiant face of the Prophet (peace and blessings be upon him). Then he (peace and blessings be upon him) asked: 'Who are you?' I said: 'My name is Jundub, and I am a man of the tribe of Banu Ghifar.'"
This report is in Musnad al-Harith (Bughyat al-Bahith: 928); al-Haythami declared its chain jayyid (good).