Sa'id bin al-Harith bin Abd al-Muttalib (may Allah be pleased with him)

Hisham bin al-Kalbi says, concerning the saying of the Messenger of Allah (peace and blessings be upon him), "And the first blood that I abolish (as blood-revenge from the time of the Jahiliyyah) is the blood of Rabi'ah bin al-Harith," that his son was being nursed among Banu Layth and was killed by Banu Hudhayl. Hisham says: Rabi'ah was not killed; rather, he lived after the Prophet (peace and blessings be upon him) until the caliphate of Sayyiduna Umar (may Allah be pleased with him). The one who was killed at the hands of Hudhayl was his son.
Mention of the virtues of Sayyiduna Sa'id bin al-Harith bin Abd al-Muttalib (may Allah be pleased with him):

It is narrated from Abu Umamah bin Sahl bin Hunayf that he came to Syria in the time of Sayyiduna Mu'awiyah (may Allah be pleased with him), and a group of the people of Syria met him and asked: What is your relationship to Mu'adh (bin Jabal)? I said: He is my cousin. They said: Shall we not tell you a hadith that he narrated to us before his death, and which he had never narrated to us before that? I said: Of course. So they told me that Mu'adh (may Allah be pleased with him) related before his death that he heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever meets Allah without associating anything with Him will enter Paradise."

Musa bin Jubayr says: I narrated this hadith of Abu Umamah to Salman al-Agharr, and he said: I bear witness that Sayyiduna Sa'id bin al-Harith bin Abd al-Muttalib (may Allah be pleased with him) narrated to me from the Messenger of Allah (peace and blessings be upon him) exactly the same hadith as the Syrians narrated from Mu'adh (may Allah be pleased with him).
Mention of the virtues of Sayyiduna Khalid bin Sa'id bin al-As bin Umayyah bin Abd Shams bin Abd Manaf (may Allah be pleased with him):