وَقالوا لَولا يَأتينا بِآيَةٍ مِن رَبِّهِ ۚ أَوَلَم تَأتِهِم بَيِّنَةُ ما فِي الصُّحُفِ الأولىٰ

And they say, "Why does he not bring us a sign from his Lord?" Has there not come to them evidence of what was in the former scriptures?