Tafsir of Ad-Dhariyat 51:54

"So turn away from them, for you are not to be blamed."

Turn away from them, meaning: distance yourself from arguing with them, for you have repeated the call to them and spared no effort in clarification, yet they refused, persisting only in arrogance and obstinacy. Thus, you are not to be blamed for turning away after having exerted your utmost effort and exceeded every customary limit in eloquence.