3 ayahs containing: حدث + صدق
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4:87 ٱللَّهُ لَآ إِلَٰهَ إِلَّا هُوَ لَيَجْمَعَنَّكُمْ إِلَىٰ يَوْمِ ٱلْقِيَٰمَةِ لَا رَيْبَ فِيهِ وَمَنْ أَصْدَقُ مِنَ ٱللَّهِ حَدِيثًا
Allah, there is no god but He-- He will most certainly gather you together on the resurrection day, there is no doubt in it; and who is more true in word than Allah?
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12:111 لَقَدْ كَانَ فِى قَصَصِهِمْ عِبْرَةٌ لِّأُو۟لِى ٱلْأَلْبَٰبِ مَا كَانَ حَدِيثًا يُفْتَرَىٰ وَلَٰكِن تَصْدِيقَ ٱلَّذِى بَيْنَ يَدَيْهِ وَتَفْصِيلَ كُلِّ شَىْءٍ وَهُدًى وَرَحْمَةً لِّقَوْمٍ يُؤْمِنُونَ
In their histories there is certainly a lesson for men of understanding. It is not a narrative which could be forged, but a verification of what is before it and a distinct explanation of all things and a guide and a mercy to a people who believe.
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Then let them bring an announcement like it if they are truthful.