Hadith No: 1
Al-Dhahabi - Siyar A'lam al-Nubala' - The Companions (ra) - Muawiya ibn Abi Sufyan
Volume: (3) - Page Number: (123)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And al-Mufaddal al-Ghalabi narrated from Abu al-Hasan al-Kufi, who said: Zayd ibn Thabit was a scribe of revelation, and Muawiya was a scribe between the Prophet (peace be upon him and his holy progeny) and the Arabs.

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Reference: Seyar A'laam al-Nobalaa Book 3

Hadith No: 2
Ibn al-Jawzi - Zād al-Ma'ād fī Hady Khayr al-Ibād - Chapter on His Wives (p.)
Volume: (1) - Page Number: (107)
[The text is lengthy, so only the relevant excerpt is provided here]
- ....and that he should take his son as a scribe. They said: Perhaps these two matters occurred after the Conquest, and the narrator gathered all of this in one hadith.

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Reference: Zaad al Maad Fi Hoda Khair al Ebaad Book 1