When it was evening, there came a rich man from Arimathea, named Joseph, who was also a disciple of Jesus. He went to Pilate and asked for the body of Jesus; then Pilate ordered it to be given to him. So Joseph took the body and wrapped it in a clean linen cloth and laid it in his own new tomb, which he had hewn in the rock. He then rolled a great stone to the door of the tomb and went away. Mary Magdalene and the other Mary were there, sitting opposite the tomb. The next day, that is, after the day of Preparation, the chief priests and the Pharisees gathered before Pilate and said, “Sir, we remember what that impostor said while he was still alive, ‘After three days I will rise again.’ Therefore command the tomb to be made secure until the third day; otherwise his disciples may go and steal him away, and tell the people, ‘He has been raised from the dead,’ and the last deception would be worse than the first.” Pilate said to them, “You have a guard of soldiers; go, make it as secure as you can.” So they went with the guard and made the tomb secure by sealing the stone. (Matthew 27:57-66, NRSV)
The Priests went to Pilate and asked him to guard the tomb of Jesus because He had said when He was alive He would rise after three days. But Pilate would not, he told them they have their own guards, they can go and seal it and protect it.
They were worried He would actually rise, or that it was all a rouse and the disciples would steal His body…
Guards or no guards, God’s plan will not fail.