Sura 41 Fussilat (Explained In Detail), aya 33

1. 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."

   41:33

Tafsiri: Saheeh International