Malachi chapter 3: "For lo, a sun will come, which will glow like a furnace; all the perpetrators of wickedness and all the audacious evildoers will be like straw. And the sun will incinerate them, so that it will leave them neither root nor branch, but the Sun of Mercy will rise with healing in its wings and shine for those who fear Me. Then will you go forth and be fat as fatted calves.''
The Abarbanel explains this: ''The sun performs opposite actions and, depending on the circumstances, it will burn or heal. It whitens laundry and browns the ski[n], 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.''
Reish Lakish of The Gemara in Nedarim [8:2] states: ''In the World to Come, there will be no Gehinnom [hell]. Rather, G-d will remove the sun from its sheath, and the righteous will be healed by it, while the wicked will be punished by it."
