Surah Ash-Shu'ara 26:188
قَالَ رَبِّىٓ أَعْلَمُ بِمَا تَعْمَلُونَ
He said, "My Lord is most knowing of what you do."
Translation: Saheeh International
Tafsir
He said ‘My Lord knows best what you are doing’ and will requite you for it.
Excerpt from Tafsir al-Jalalayn, commentary on 26:188, via Quran.com. The reader has the full commentary and 9 more tafsirs.