I say:
The correct view is that they were called Rāfidis because they rejected Zayd ibn Alī ibn al-Husayn ibn Alī ibn Abī Tālib when he rose in Kufa during the reign of Hishām ibn Abd al-Malik. Al-Asharī and others also mentioned this(1).
They said(2): “They were called the Zaydis(3) because they adhered to the position of Zayd ibn Alī ibn al-Husayn ibn Alī ibn Abī Tālib. Zayd(4) received pledges of allegiance in Kufa(5) during the reign of Hishām ibn Abd al-Malik. The governor of Kufa was Yūsuf ibn Umar al-Thaqafī. Zayd gave Alī ibn Abī Tālib precedence over all the other Companions of the Prophet(6)—may Allah bless him and grant him peace—while affirming his loyalty to Abū Bakr and Umar, and he held that one should rise against unjust rulers. When he rose openly in Kufa(7) with the followers who had pledged allegiance to him, he heard(8) some of them maligning(9) Abū Bakr and Umar. He denounced(10) those from whom he heard this, whereupon those who had pledged allegiance to him(11) abandoned him. He asked them(12), ‘Have you rejected me?’ (*) They replied, ‘Yes.’(13)”
It is therefore said that they