وَالْبَاقِيَاتُ الصَّالِحَاتُ خَيْرٌ عِندَ رَبِّكَ ثَوَابًا وَخَيْرٌ مَّرَدًّا
''And the everlasting virtues are better with your Lord in respect of reward and better in their return". - Maryam 19:76 ⧉
These words have been interpreted differently by different scholars as has been explained at some length in the commentary of Sarah Al-Kahf (سورۃ کھف). The more plausible interpretation, however, is that the words refer to submission to the commands of Allah and to good deeds, the benefits of which are everlasting.
مَّرَدًّا by means consequences, and the sense of this verse Maryam 19:76 ⧉ is that good deeds alone are the real wealth whose reward is great and whose result is eternal peace.