Surah Al-A'raf 7:106

قَالَ إِن كُنتَ جِئْتَ بِـَٔايَةٍ فَأْتِ بِهَآ إِن كُنتَ مِنَ ٱلصَّـٰدِقِينَ

[Pharaoh] said, "If you have come with a sign, then bring it forth, if you should be of the truthful."

Translation: Saheeh International

Tafsir

Said he Pharaoh to him ‘If you have come with a sign as you claim then produce it if you are of those who speak the truth’ in this.

Excerpt from Tafsir al-Jalalayn, commentary on 7:106, via Quran.com. The reader has the full commentary and 9 more tafsirs.