الاعراف — Al-A'raf Ayat 203
وَاِذَا لَمْ تَأْتِهِمْ بِاٰيَةٍ قَالُوْا لَوْلَا اجْتَبَيْتَهَاۗ قُلْ اِنَّمَآ اَتَّبِعُ مَا يُوْحٰٓى اِلَيَّ مِنْ رَّبِّيْۗ هٰذَا بَصَاۤىِٕرُ مِنْ رَّبِّكُمْ وَهُدًى وَّرَحْمَةٌ لِّقَوْمٍ يُّؤْمِنُوْنَ
Wa iżā lam ta'tihim bi'āyatin qālū lau lajtabaitahā, qul inamā attabi‘u mā yūḥā ilayya mir rabbī, hāżā baṣā'iru mir rabbikum wa hudaw wa raḥmatul liqaumiy yu'minūn(a).
"And when you, [O Muhammad], do not bring them a sign, they say, "Why have you not contrived it?" Say, "I only follow what is revealed to me from my Lord. This [Qur'an] is enlightenment from your Lord and guidance and mercy for a people who believe.""