What do “qālā … dhālika” refer to?

Trustworthy Transmission, the Report of a Fāsiq, and Responsible Narration

• Shuʿbah and Sufyān; the previously quoted Prophetic words
• Samurah and al-Mughīrah; the previously quoted Prophetic wording
• Wakīʿ and Abū Bakr ibn Abī Shaybah; the earlier Prophetic wording
• Ḥabīb and Maymūn; distinct matns from the two Companions