What was the response of Ibn Abbas when he learnt that Muawiya (peace be upon him) had offered one rak'a witr prayer after the `Isha prayer?
 Narrated Ibn Abu Mulaika:                     Muawiya offered one rak`a witr prayer after the `Isha prayer, and at that time a freed slave of Ibn `Abbas was present. He (i.e. the slave) went to Ibn `Abbas (and told him that Muawiya offered one rak`a witr prayer). Ibn `Abbas said, "Leave him, for he was in the company of Allah's Apostle."