In the Old testament there you will find many sins that were punishable by death or other heavy penances such as banishing a person from the community (like our excommunication). Thank God for His Mercy in that He took on our sins and died for us. Otherwise the OT law would still be carried out among us. What happened to Him I deserved. Mortal sin is called mortal for a reason.
Murder: Death (usually by stoning, a very painful way to die of course)
Rape: in one unusual case, the rapist had to marry the victim and pay money to the victim’s father. However, the penalty was usually death.
Petty theft: amputated hand
Grand theft: hand amputated, thief forced to eat the hand.