السلام عليكم و رحمة الله و بركاته Is it authentic, that after praying the 2 rakat after dhuhr sunnah, that you pray another 2 rakat. And the reward of it is jahanam being made forbidden for you or something along those lines in terms of reward.

Ustadh AbdulAziz al-Haqqan

4 rakas before thuhr and 4 rakas after thuhr this is the hadeeth.