Sa'd ibn Abi Waqqas in the context of "The ten to whom Paradise was promised"

The Sahabah (Arabic: اَلصَّحَابَةُ, romanized: aṣ-ṣaḥāba, lit. 'the companions'), also known as the Companions of Muhammad, were the Muslim disciples and followers of the Islamic prophet Muhammad who saw or met him during his lifetime. The companions played a major role in Muslim battles, society, hadith narration, and governance during and after the life of Muhammad. The era of the companions began following the death of Muhammad in 632 CE, and ended in 110 AH (728 CE) when the last companion Abu al-Tufayl died.

Later Islamic scholars accepted their testimony of the words and deeds of Muhammad, the occasions on which the Quran was revealed and other important matters in Islamic history and practice. The testimony of the companions, as it was passed down through trusted chains of narrators (asānīd), was the basis of the developing Islamic tradition. From the traditions (hadith) of the life of Muhammad and his companions are drawn the Muslim way of life (sunnah), the code of conduct (sharia) it requires, and Islamic jurisprudence (fiqh).

ʿUmar ibn Saʿd ibn Abi Waqqas (Arabic: عمر بن سعد; died 686) was a son of prophet Muhammad's companion, Sa'd ibn Abi Waqqas. He was born in Medina and later moved to, and stayed until his death in, Kufa, which was founded by his father.

He took orders from Ubaydullah ibn Ziyad. He was one of the leaders of the troops who killed Husayn ibn Ali in the Battle of Karbala in 680, the first major battle of the Second Islamic Civil War (Second Fitna).