7:21
وَقَاسَمَهُمَآ إِنِّى لَكُمَا لَمِنَ ٱلنَّـٰصِحِينَ
waqāsamahumā innī lakumā lamina l-nāṣiḥīna
And he swore [by Allāh] to them, "Indeed, I am to you from among the sincere advisors."
— Saheeh International
and he swore to them, ‘I am giving you sincere advice’-
— M. A. S. Abdel Haleem
And he [Shaitân (Satan)] swore by Allâh to them both (saying): "Verily, I am one of the sincere well-wishers for you both."
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali