Musa bin Uqbah said: Abu Salamah narrated this hadith to me from the man who passed by the Prophet (peace and blessings be upon him) while the Prophet (peace and blessings be upon him) was conversing privately with Sayyiduna Jibril (peace be upon him). Abu Salamah says: That man avoided going near the Prophet (peace and blessings be upon him), fearing that he might intrude on his conversation. The next morning the Prophet (peace and blessings be upon him) asked him: "What was the reason? When you passed by me last evening, why did you not greet me?" He submitted: "I saw you conversing with a man, and I feared that you might dislike my coming near you." The Prophet (peace and blessings be upon him) asked: "Do you know who that person was?" He submitted: "No!" The Prophet (peace and blessings be upon him) said: "That was Jibril; had you greeted, he would have returned the greeting." The narrator said: I have heard from someone other than the narrator Abu Salamah that the man was Sayyiduna Harithah bin al-Nu'man (may Allah be pleased with him).
Ahmad recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15740