What scripture did Peter and John not yet know after seeing the empty tomb?
After seeing the empty tomb, Peter and John did not yet know the Scripture that Christ must rise again from the dead. At that late time, they still did not understand the scriptural necessity that He must be raised from the dead.
Les explains that after Peter entered the sepulcher and saw the linen clothes lying and the napkin wrapped together in place by itself, John also went in. Yet verse nine indicates that as yet, at that late time, Peter and John knew not the scripture that He must rise again from the dead. So even after witnessing the empty tomb, their understanding of the resurrection prediction was incomplete.