Tablet of Ahmad — Paragraph 7
Source (Arabic)
قُلْ يَا قَوْمِ إِنْ تَكْفُرُوْا بِهَذِهِ ٱلْآيَاتِ فَبِأَيِّ حُجَّةٍ آمَنْتُمْ بِاللهِ مِنْ قَبْلُ هَاتُوْا بِهَا يَا مَلَأَ ٱلْكَاذِبِينَ
Translation
O people, if ye deny these verses, by what proof have ye believed in God? Produce it, O assemblage of false ones.