My father worked for the railroad when I was younger. One night a train was backing up to hook up to some other cars and one man was not watching. He was in the way and the train made the connection right through his body.
He did not die immediately, but he knew he had only a short time to live. He told other men there to tell his wife where she could find insurance papers, his will, some savings account books, and some other things. He realized that all of his plans for the future would not come true. All that mattered now was that his wife be taken care of. Then, just before he died, he told the men to tell his wife, "I love you." Those were the last words he ever spoke. It was the most important thing and he used his last words for it.
Jesus did too. The last words he spoke on earth were these... the Great Commission.