Which exact contact is established by “he heard ʿAlī preaching”?

The Grave Warning Against Lying About the Prophet: Narration, Intent and Critical Duty

• Shuʿbah’s direct hearing from Manṣūr
• Ghundar’s direct hearing from Abū Bakr
• Ribʿī ibn Ḥirāsh’s hearing from ʿAlī
• Manṣūr’s direct hearing from the Prophet