after lord Krishna death . Arjuna return to hastinapur with lots of children and their mothers , specially laskmana (Daughter of Duryadhan). Then Arjuna run to his brother Yudhistir like a mad and told him every thing happened to kingdom Dwaraka . Every people died on that place , he also said that .Lord Krishna said if someone life destination is complete then it's impossible to stay for him or her on this universe. King Yudhistir understand lord Krishna message . Then he makes his grand son king of hastinapur and Pandavas gone for exile . 170 years later King died due to snake bite . And from that time sins started people become angry , greedy, lust, lazy , proud etc. there are many people , kings who hand seven deadly sins