'Alqamah

Sa'id in hadith chains most likely refers to Sa'id ibn al-Musayyib al-Makhzumi, the foremost jurist and hadith scholar of the Tabi'in generation in Medina and often described as the greatest of the seven jurists of Medina. His father and grandfather were both Companions of the Prophet ﷺ. He studied under numerous Companions, most prominently Abu Huraira (may Allah be pleased with him), whose daughter he married, and Umar ibn al-Khattab. He was renowned for his unmatched mastery of the Sunnah, his fierce independence, his refusal to accept gifts from rulers, and his willingness to suffer punishment rather than compromise on religious principles — he was flogged for refusing to give the oath of allegiance to Hisham ibn Abd al-Malik's son while the previous caliph was still alive. He narrated thousands of hadiths and his legal opinions were authoritative across the Muslim world. He passed away in Medina around 93–94 AH. His narrations appear throughout all six major hadith collections.