The raising of Lazarus was a type of the Savior's own resurrection

When Jesus finally arrived at the tomb of Lazarus, he had been dead four days ( John 11:1–54).  No doubt existed that he was dead.  In delaying his arrival until so long after his friend's death, the Savior demonstrated his divinity and power to bring the dead back to life.  This was also a type for his own resurrection.  Jesus himself would die and come back to life.  And through this divine power, all will be resurrected even as was the Savior.