Jamieson, Fausset and Brown on Matthew 27:66

66. So they went, and made the sepulchre sure, sealing the stone--which Mark (Mr 16:4) says was "very great."

and setting a watch--to guard it. What more could man do? But while they are trying to prevent the resurrection of the Prince of Life, God makes use of their precautions for His own ends. Their stone-covered, seal-secured sepulchre shall preserve the sleeping dust of the Son of God free from all indignities, in undisturbed, sublime repose; while their watch shall be His guard of honor until the angels shall come to take their place.