[Pharaoh] said, "If you have come with a sign, then bring it forth, if you should be of the truthful."
The Saheeh International Quran Translation
قَالَ إِن كُنتَ جِئْتَ بِـَٔايَةٍ فَأْتِ بِهَآ إِن كُنتَ مِنَ ٱلصَّٰدِقِينَ[Pharaoh] said, "If you have come with a sign, then bring it forth, if you should be of the truthful."