7:21
وَقَاسَمَهُمَآ إِنِّى لَكُمَا لَمِنَ ٱلنَّـٰصِحِينَ
waqāsamahumā innī lakumā lamina l-nāṣiḥīna
and he swore to them, ‘I am giving you sincere advice’-
And he [Shaitân (Satan)] swore by Allâh to them both (saying): "Verily, I am one of the sincere well-wishers for you both."