John 11:11-15

After he had said this, he went on to tell them, “Our friend Lazarus has fallen asleep; but I am going there to wake him up.” His disciples replied, “Lord, if he sleeps, he will get better.” Jesus had been speaking of his death, but his disciples thought he meant natural sleep. So then he told them plainly, “Lazarus is dead, and for your sake I am glad I was not there, so that you may believe. But let us go to him.”