Sabry Amin 
Tools of Diplomacy in Islam [PDF ebook] 

      The Messenger of Allah (Pb UH) was the most eloquent of all people, and he had set disciplines for morals of talk represented by the revealed description and a quiet talk with no pauses. His talk was usually punctuated by periods of silence that enable both the speaker and the listener to meditate, with the repetition of the important words for three times so that the listener can memorize them. The Messenger of Allah (Pb UH) did not favor mannerism in talking and in play on words. Al-Dhahhak Ibn reported through Sharhabeel through Abu Huraira that the Messenger of Allah (Pb UH) has said: ( He who learns the form of talk to hurt the hearts of men or people, Allah shall not accept in the Hereafter neither his form nor his justice).