Surah Fussilat Verse 33

وَمَنْ أَحْسَنُ قَوْلًا مِمَّنْ دَعَا إِلَى اللَّهِ وَعَمِلَ صَالِحًا وَقَالَ إِنَّنِي مِنَ الْمُسْلِمِينَ

And who is better in speech than one who invites to Allah and does righteousness and says, "Indeed, I am of the Muslims