This is referring to reviving a sunnah that people don’t apply anymore or have neglected such as duha prayer  if people stopped doing or staying in the masjid until sunrise and praying two Rakah.

Al-Munthir ibn Jareer reported on the authority of his father that Allaah’s Messenger said, “If anyone introduces a good tradition that is followed, he has a reward for that and the reward equivalent to the reward of those who follow it without any diminishing in their own rewards. And if anyone introduces an evil tradition that is followed, its burden as well as the burden of those who act upon it, will lie upon him without any diminishing in their own burdens.”..Is this sahih? If yes, what kind of traditions are being referred to as acceptable? Maybe if i can get some current ones in Islam please…