After Fajr Namaz - Dua to Remember

Simak ibn Harb (RA) reported: I said to Jabir bin Samura (RA): Did you sit in the company of the Messenger of Allah (ﷺ) ? He said: Yes, many times. He (ﷺ) used to sit at the place where he observed the Fajr or Maghrib prayer till the sun rose or when it had risen; he would stand, and they (his Companions) would talk about matters (pertaining to the days) of Jahiliyyah, and they would laugh (on these matters) while (the Prophet ﷺ) only smiled.