Al A'raf, 203 Ayah
7:203
وَإِذَا لَمۡ تَأۡتِهِم بِـَٔايَةٖ قَالُواْ لَوۡلَا ٱجۡتَبَيۡتَهَاۚ قُلۡ إِنَّمَآ أَتَّبِعُ مَا يُوحَىٰٓ إِلَيَّ مِن رَّبِّيۚ هَٰذَا بَصَآئِرُ مِن رَّبِّكُمۡ وَهُدٗى وَرَحۡمَةٞ لِّقَوۡمٖ يُؤۡمِنُونَ ٢٠٣
Wa 'Idhā Lam Ta'tihim Bi'āyatin Qālū Lawlā Ajtabaytahā ۚ Qul 'Innamā 'Attabi`u Mā Yūĥá 'Ilayya Min Rabbī ۚ Hādhā Başā'iru Min Rabbikum Wa Hudáan Wa Raĥmatun Liqawmin Yu'uminūna
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."