ἠσφαλίσαντο is to be taken with the last clause μετὰ τῆς κουστωδίας, which points to the main means of securing the tomb against plunder. The participial clause σφραγίσαντες τὸν λίθον is a parenthesis pointing to an additional precaution, sealing the stone, with a thread over it and sealed to the tomb at either end. The worthy men did their best to prevent theft, and the resurrection!

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Old Testament