Abu Dawud Book 36, Hadith Number 5195.

Narated By AbuDharr : Ayyub ibn Bushayr ibn Ka’b al-Adawi quoted a man of Anazah who said that he asked AbuDharr when he left Syria: I wish to ask you about a tradition of the Apostle of Allah (PBUH). He said: I shall tell you except that it is something secret. Did the Apostle of Allah (PBUH) shake hands with you when you met him? He replied: I never met him without his shaking hands with me. One day he sent for me when I was not at home. When I came I was informed that he had sent for me. I came to him and found him on a couch. He embraced me and that was better and better.