Among them:
Hazn (1) ibn Abi Wahb ibn ʿAmr ibn ʿĀʾidh (2) ibn ʿImrān al-Makhzūmī.
He was numbered among the Emigrants; some say he embraced Islam in the Year of the Conquest. He is the grandfather of Saʿīd ibn al-Musayyib.
The Messenger of Allah ﷺ wished to rename him Sahl (Easy), but he declined, saying, “I will not change a name my parents gave me.” Because of that, ḥuznah (hardness) has remained among us (3).
He was martyred at al-Yamāmah, and his two sons ʿAbd al-Raḥmān and Wahb were killed with him, as well as his grandson Ḥakīm ibn Wahb ibn Hazn.

Among those who were also martyred that year was Dādhawayh the Persian, one of the Yemeni commanders who slew al-Aswad al-ʿAnsī. He was murdered treacherously by Qays ibn Makshūḥ when the latter apostatized, before later returning to Islam. When the Siddīq reproached him for the killing, he denied it, so Abū Bakr accepted his outward Islam.

Among them:
Zayd (4) ibn al-Khaṭṭāb ibn Nufayl al-Qurashī al-ʿAdawī, Abū Muḥammad—the paternal brother of ʿUmar ibn al-Khaṭṭāb, and the elder of the two. He embraced Islam early, fought at Badr and every subsequent battle. The Messenger of Allah ﷺ made him the brother-in-faith of Maʿn ibn ʿAdī al-Anṣārī, and both were slain at al-Yamāmah. On that day the standard of the Emigrants was in his hand; he advanced with it until he was killed and it dropped, whereupon Sālim, the freedman of Abū Ḥudhayfah, picked it up. That same day Zayd killed al-Rajjāl ibn ʿUnfuwa—whose given name was Nahār. Al-Rajjāl had professed Islam, memorized al-Baqarah, then apostatized, returned to Musaylimah, affirmed his claim to prophethood, and testified on his behalf, causing great turmoil. His end came at Zayd’s hand—may Allah be pleased with Zayd.

Zayd was later killed by a man called Abū Maryam al-Ḥanafī. He afterwards embraced Islam and said to ʿUmar, “O Commander of the Believers, Allah honored Zayd by my hand and did not disgrace me by his.”
Others say he was killed by Salamah ibn Ṣubayḥ, a cousin (5) of Abū Maryam; this view was preferred by Abū ʿUmar (6), who argued that ʿUmar later appointed Abū Maryam as judge. That, however, does not negate the earlier report—Allah knows best.

When news of Zayd’s death reached ʿUmar he said, “He has outstripped me to the two blessed things: he entered Islam before me and was martyred before me.”