The Rambam mentioned above Hilchas Teshuva 8,2 says ועושה האמת מפני שהוא אמת he doesn’t do mitzvos for rewards but he does it because it is the right thing to do.
The Rambam mentioned above Hilchas Teshuva 8,2 says ועושה האמת מפני שהוא אמת he doesn’t do mitzvos for rewards but he does it because it is the right thing to do.