The Gemara in Nedarim [8:2] states:Reish Lakish states: ''In the World to Come, there will be no Gehinnom [hell]. Rather, Hashem will remove the sun from its sheath, and the righteous will be healed by it, while the wicked will be punished by it, as it says [Malachi 3:19] ''A sun will come which will burn like a furnace; all the wicked and all the evildoers will be like straw, and the sun will incinerate them... But a sun of kindness will shine for those who fear Me, with healing in its rays.''
The Abarbanel explains this verse:''The sun performs opposite actions and, depending on the circumstances, it will burn or heal. It whitens laundry and browns the ski, it melts wax and freezes salt, and therefore, whereas the evildoers who are empty and dry like straw will be burnt, the righteous ones who are damp and moist, will be healed.''
"Israel will only be redeemed if they return''. [Sanhedrin 97: 2]
