The Holy Quran 7:68 — Surah Al-A'raf
Arabic text
أُبَلِّغُكُمْ رِسَـٰلَـٰتِ رَبِّى وَأَنَا۠ لَكُمْ نَاصِحٌ أَمِينٌ
Translation
"I convey to you the messages of my Rabb and I am a trustworthy advisor to you (I shall certainly not betray you)."
Tafsir (excerpt) — Tafsir Usmani
that is, nothing I say is foolish; rather, I am fulfilling the duty of the office of messengership entrusted to me by Allah. It is your foolishness that, by calling your true well-wishers — whose trustworthiness and honesty were already reassuring — foolish, you harm yourselves.
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