John 20: 1 - 7: The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre. Then she runneth, and cometh to Simon Peter, and to the other disciple, whom Jesus loved, and saith unto them, They have taken away the Lord out of the sepulchre, and we know not where they have laid him. Peter therefore went forth, and that other disciple, and came to the sepulchre. So they ran both together: and the other disciple did outrun Peter, and came first to the sepulchre. And he stooping down, and looking in, saw the linen clothes lying; yet went he not in. Then cometh Simon Peter following him, and went into the sepulchre, and seeth the linen clothes lie, And the napkin, that was about his head, not lying with the linen clothes, but wrapped together in a place by itself.
John 20: 7 is understood when the custom of a Jewish feast is examined.
If the master (or a guest) had finished eating and was going to leave the table and not return, then he would throw his napkin in a heap on the table to notify the servants that he had finished and would not return. If he had to leave the table but was going to return in a few minutes, then he would fold his napkin and place it on the table to notify the servants that he was coming back.
The folded napkin in the sepulchre showed that the Master (Jesus) was alive and was coming back.