“…The best of your days is Friday: on it Adam was created, on it he died, on it the Trumpet will be blown, and on it the Concussion will strike. So increase your prayers upon me on that day, for your prayers are presented to me.” They said, “O Messenger of Allah, how will our prayers be presented to you when you have decayed?” He replied, “Allah has forbidden the earth to consume the bodies of the prophets.” 1
Among the corroborating reports are his ﷺ words, “The prophets are alive in their graves, praying.” 2 And his saying, “On the night I was taken up, I passed by Moses standing in prayer in his grave.” 3 And his saying, “Allah has roaming angels who convey to me the greetings of my community.” 4
The second answer is juristic in nature. Its purport is that his ﷺ life after death is different from his life before it. The life of the barzakh (intermediate realm) belongs to the unseen; only Allah, exalted is He, fully knows its reality. What is certain, however, is that it differs from worldly life and is not governed by its laws. In this world a person eats and drinks, breathes, marries, moves about, relieves himself, falls ill, and speaks; yet no one can prove that after death—even for the prophets, foremost among them our Prophet Muhammad ﷺ—any of these functions continue.