Theophylact of Ohrid

Or let him say, Christ did not deny that John was to die, for whatever is born dies; but said, I will that he tarry till I come, i. e. to live to the end of the world, and then he shall suffer martyrdom for Me. And therefore they confess that he still lives, but will be killed by Antichrist, and will preach Christ’s name with Elias. But if his sepulchre be objected, then they say that he entered in alive, and went out of it afterwards.