The penalty for sin in the Bible is spiritual death. This is the penalty that Christ paid on the cross. The physical suffering Christ endured was God’s disciplinary wrath not His penal wrath. The Bible tells us that Christ learned obedience through what He suffered. Moreover, Christ told James and John that they would drink from the cup He would drink from. Christ asked God to remove the cup yet He said not my will but Yours be done. Now, since the sins of James and John were punished at the cross then Jesus couldn’t have been referring to God’s penal wrath. For to punish James and John for their sins after they have already been punished on Christ would be a double payment for their sins which is unjust. The cup of God’s wrath in the Bible doesn’t have to be only penal. It’s often disciplinary. Another reason we know it was disciplinary is because of Isaiah 53:5 -
The chastening for our well being fell upon Him.
The Hebrew word here is musar
musar:
discipline, chastening, correction
The NASB Strongest Exhaustive Concordance
There is no penal element in this word. It’s for disciplinary or corrective purposes. It’s a masculine noun meaning instruction, discipline.