"So they went, and made the sepulchre sure, sealing the stone, and setting a watch" ~ Matthew 27:66
They carefully selected a huge boulder. Rolled it against the open tomb, sealed it, and placed a hand-picked guard of soldiers to watch the grave of Jesus. They "made the sepulchre sure." They made sure to their own satisfaction, that the body of Jesus would never be seen again. Jesus had said He would rise again and the chief priests and Pharisees urged Pilate to take all possible precautions to see that His disciples didn't steal His body and the spread the story that He had risen. So, they "made the sepulchre sure." Completely sure, they thought.
But, glory to God in the very highest, the only thing that was really sure was that Jesus was going to get up under the power of God and walk out of that sealed tomb! He didn't roll the stone away in order to get out. He didn't need to. The stone was not even rolled away until " ... the end of the sabbath, as it began to dawn toward the first day of the week ..." The guards were still there, the stone was still in place, but Jesus was gone. The stone was merely rolled back so that when His disciples came they could see inside and know that He had told them the truth. They "made the sepulchre sure" against themselves only. Jesus Christ Himself could not have been "sealed in" by a mere stone, because He Himself is Eternal Life.
"I am he that liveth, and was dead; and, behold, I am alive for evermore ..."