Sura al-Sajdah 32:3

أَمْ يَقُولُونَ ٱفْتَرَىٰهُ بَلْ هُوَ ٱلْحَقُّ مِن رَّبِّكَ لِتُنذِرَ قَوْمًا مَّآ أَتَىٰهُم مِّن نَّذِيرٍ مِّن قَبْلِكَ لَعَلَّهُمْ يَهْتَدُونَ

am yaqūlūna iftarāhu bal huwa l-ḥaqqu min rabbika li-tundhira qawman mā atāhum min nnadhīrin min qablika la-ʿallahum yahtadūna

Or do they say, "He has forged it"? Nay, it is the Truth from thy Lord, that thou mayest admonish a people to whom no warner has come before thee: in order that they may receive guidance.