Al-A‘râf 7:106
قَالَ إِن كُنتَ جِئْتَ بِآيَةٍ فَأْتِ بِهَا إِن كُنتَ مِنَ الصَّادِقِينَ ١٠٦
Qala in kunta jita biayatin fati biha in kunta mina alssadiqeena
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“(Pharaoh) said: If thou comest with a token, then produce it, if thou art of those who speak the truth.” (7:106)