What unifies verbs such as «نُورِدُ، نُصْدِرُ، نَنْفِي، نَحْمِلُ»?

ʿAmr ibn Kulthūm: Address to Abā Hind, Tribal Pride and the Mill of War (Verses 23–38)

• All are third-person dual verbs
• All are demonstrative pronouns
• First-person plural voice presenting the tribe collectively
• All are passive perfect verbs