Why did the Jewish leaders and Romans seal Jesus's tomb?
The Jewish leaders and Romans sealed the tomb because they remembered Jesus had said He would rise from the dead after three days. Their frustration and concern prompted them to ensure the sepulcher was sealed. This action showed they took His words seriously.
Les explains that the frustration of the Jewish leaders as well as the Romans led them to make sure the sepulcher would be sealed. They remembered that He had said that after three days He would rise from the dead. So the sealing was a direct response to His prediction. Les also notes that resurrection never took place until Jesus was raised from the dead, and immediately after His resurrection others came out of the graves as first fruits, but that is separate from the sealing.