Surah Yusuf 12:73

قَالُوا۟ تَٱللَّهِ لَقَدْ عَلِمْتُم مَّا جِئْنَا لِنُفْسِدَ فِى ٱلْأَرْضِ وَمَا كُنَّا سَـٰرِقِينَ

They said, "By Allāh, you have certainly known that we did not come to cause corruption in the land, and we have not been thieves."

Translation: Saheeh International

Tafsir

They said ‘By God’ ta’Llāhi is an oath entailing astonishment ‘You know very well that we did not come to work corruption in the land and we are certainly not thieves’ that is we have never stolen anything.

Excerpt from Tafsir al-Jalalayn, commentary on 12:73, via Quran.com. The reader has the full commentary and 9 more tafsirs.