In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Indeed this illustrious companion of the Messenger [sallal-laahu-alayhi-wasallam] has a high station and status in the sight of the people who follow the authentic Sunnah and the truth. And even before this station and status of his in the sight of the people who follow the authentic Sunnah and truth, he has a high station in the sight of the Messenger of Allaah [sallal-laahu-alayhi-wasallaam]. And one of those virtues is that he was a companion of the Messenger and a relative of his through marriage ties [i.e. the Messenger (sallal-laahu-alayhi-wasallam) married Muaawiyah’s (radiyallaahu-anhu) sister, Umm Habeebah (radiyallaahu-anhaa)], and he was also from the scribes who wrote down the revelation sent down to the believers through the Messenger [sallal-laahu-alayhi-wasallam].
Indeed the Prophet [sallal-laahu-alayhi-wasallaam] made a great supplication for him. Abdur-Rahmaan Ibn Abee Umayra reported that the Prophet [sallal-laahu-alayhi-wasallaam] said to Mu’aawiyyah: “O Allaah! Make him a guide, one guided to the (straight path) and guide (others) by way of him”.
Irbaad Ibn Saariyah [radiyallaahu-anhu] said: I heard the Messenger [sallal-laahu-alayhi-wasallaam] saying: “O Allaah! Teach Mu-aawiyyah the Book (i.e. the Qur’aan) and Al-Hisaab (i.e. knowledge of math, arithmetic, accounting etc) and protect him from the punishment” .
Umm Haraam [radiyallaahu-anhaa] reported that she heard the Prophet [sallal-laahu-alayhi-wasallaam] saying: “Paradise will be granted to the first batch of my followers who will undertake a naval expedition.” (Umm Haraam added): I said, “O Messenger of Allaah! Will I be amongst them?” He replied: “You are amongst them” The Prophet (sallal-laahu-alayhi-wasallaam) then said, “The first army amongst my followers who will invade Caesar’s city will be forgiven their sins’. I asked, ‘’Will I be one of them, O Messenger of Allaah?” He replied: “No”. Al-Haafidh Ibn Hajar [rahimahullaah] said: “Al-Muhallab [rahimahullaah] said: This hadeeth contains [an outstanding virtue] of Mu’aawiyyah because he was the first to undertake a naval expedition.
Muaawiyah has [virtues with regards to performance of great Jihaad in making uppermost Allaah’s statement [or command] لا إله إلا الله –None has the right to be worshiped except Allaah]; conquests [i.e. in order that mankind may single out Allaah in worship and abandon everything worshiped besides Allaah] and other distinguished virtues. And [from those distinguished virtues of Mu-aawiyyah] are: Mutual tolerance, kindness, forbearance, patience and justice. And if he had nothing else other than the virtue of being a companion of the Messenger, it would have been sufficient for him.
Abdullaah Ibul Mubaarak [rahimahullaah] was asked about Mu’aawiyyah [radiyallaahu-anhu], so he said: “What should I say about a man who [when] the Messenger [sallal-laahu-alayhi-wasallam] said: [سمع الله لمن حمده (i.e. in the prayer], he said [ربنا ولك الحمد i.e. whilst praying] behind him.
It was said to him [i.e. Abdullaah Ibnul Mubaarak]: Who is more virtuous-him [i.e. Mu’aawiyyah] or Umar Bin Abdul-Azeez? He said: “The dust that was in Mu‘aawiyah’s nosetrill whilst he was with the Messenger of Allaah [sallal-laahu-alayhi wa sallam] is better and more virtuous than Umar Bin Abdul Azeez!
Paraphrased: See link http://www.rabee.net/ar/articles.php?cat=8&id=224