English translation of the verse 21 surah - And he [Shaitan (Satan)] swore by Allah to them both (saying): "Verily,

Surat Al-A‘raf Verse No. 21: Reading and listening

Translation of the verse 21 from Surah Al-A‘raf : Number of verses 206 - - page 152 - Part 8.

﴾وَقَاسَمَهُمَآ إِنِّي لَكُمَا لَمِنَ ٱلنَّٰصِحِينَ ﴿
[ الأعراف: 21]

And he [Shaitan (Satan)] swore by Allah to them both (saying): "Verily, I am one of the sincere well-wishers for you both."

English - Sahih International

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

Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(7:21) And he swore to them both: 'Surely I am your sincere adviser.'

Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

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Source : Al-A‘raf Verse 21: And he swore [by Allah] to them, "Indeed, I am to you from among the sincere advisors."