Virtues of Ubaydah bin al-Harith bin Abd al-Muttalib (may Allah be pleased with him): the martyrdom of Ubaydah bin al-Harith

It is narrated from Muhammad bin Umar that the first banner the Messenger of Allah (peace and blessings be upon him) tied was for Hamzah bin Abd al-Muttalib, then the banner of Ubaydah bin al-Harith bin Abd al-Muttalib, which was sent towards Rabigh, which lies between al-Juhfah and Qudayd.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he mentioned the mubarazah (single combat): Utbah bin Rabi'ah killed Ubaydah bin al-Harith in single combat. Utbah struck him on his shin and severed it. Then the Messenger of Allah (peace and blessings be upon him) had him carried, and he died at al-Safra' on the way back from Badr, and he was buried there.
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.