From the sayings of the trustworthy scholars regarding the Companions
Author: The Shaikh and Muhaddith Abdul-Muhsin Ibn Hamad Al-Abbaad.
Publisher: Dar as-Sahaba Publications (01-Aug-02)
Abdullaah Ibn Mubarak was asked about Muaawiyah. He said, What should I say about a man who, when the Prophet (Salaahu alaihi wa Sallam) said, Sami Allaahu liman Hamidah (Allaah responds to the one who praises Him), Muaawiyah, standing behind him said, Our Lord to You belongs praise.