"And they turn to Allah" means they have turned towards Him, sincere in their devotion. "For them is glad tidings," meaning Paradise. "So give glad tidings to My servants, who listen to the word and follow the best of it," meaning: give them glad tidings of Paradise.
﴿وأنابوا إِلَى الله﴾ أَقبلُوا مُخلصين إِلَيْهِ ﴿لَهُمُ الْبُشْرَى﴾ يَعْنِي الْجنَّة ﴿فَبَشِّرْ عِبَادِ الَّذِينَ يَسْتَمِعُون القَوْل فيتبعون أحْسنه﴾ اي: بشرهم بِالْجنَّةِ ,
