Surah As-Sajdah (The Prostration), Verse 3

اَمْ یَقُوْلُوْنَ افْتَرٰىهُ بَلْ هُوَ الْحَقُّ مِنْ رَّبِّكَ لِتُنْذِرَ قَوْمًا مَّاۤ اَتٰىهُمْ مِّنْ نَّذِیْرٍ مِّنْ قَبْلِكَ لَعَلَّهُمْ یَهْتَدُوْنَ ۟

Am yaqooloonaf taraahu bal huwal haqqu mir rabbika litunzira qawma maaa ataahum min nazeerim min qablika la'allahum yahtadoon

“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.”

Quran 32:3 (Yusuf Ali Translation)