ʿUbaydullah’s response to Umar ibn Saʿd’s letter/ Imam Husayn ('a)’s dignified and uncompromising attitude toward ibn Ziad and his remarks in his letter/ Imam Husayn ('a)’s response to Qays ibn Ashʿath with regard to pledging allegiance to Yazid/ The day Kanānah ibn ʿAtīq j o i ned Imam Husayn ('a) in Karbala