Explanation of Sahih Muslim 5:161 (587)

Al-Bukhari , Muslim and Sunan An-Nasai report: "I heard the Messenger of Allah ﷺ seeking refuge from the trial of Ad-Dajjal in prayer." Other Hadith refer to Ad-Dajjal as a false prophet that would appear in future, before the coming of the Messiahﷺ and the resurrection of Muhammadﷺ, and the final trial (which is in the Hand of God). For me, the questions arises As Muhammad ﷺ died before the predicted time and woud be resurrected later, what should be his concern? How can it be explained that Muhammad ﷺ seeked refuge from the trial of Ad-Dajjal in prayer?