Quran 7:21 — Surah Al-A'raf, ayah 21

وَقَاسَمَهُمَآ إِنِّي لَكُمَا لَمِنَ ٱلنَّـٰصِحِينَ

And he swore [by Allah] to them, "Indeed, I am to you from among the sincere advisors

i zaklinjaše im se: "Ja sam vam, zaista, savjetnik iskreni!"