Fussilat 41:33

Waman ahsanu qawlan mimman daAAaila Allahi waAAamila salihan waqalainnanee mina almuslimeen

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

Who can be better in words than the one who calls towards Allah, and acts righteously and says, “I am one of those who submit themselves (to Allah)”?