Al-A'raf - 7:203

وَإِذَا لَمْ تَأْتِهِم بِآيَةٍ قَالُواْ لَوْلاَ اجْتَبَيْتَهَا قُلْ إِنَّمَا أَتَّبِعُ مَا يِوحَى إِلَيَّ مِن رَّبِّي هَـذَا بَصَآئِرُ مِن رَّبِّكُمْ وَهُدًى وَرَحْمَةٌ لِّقَوْمٍ يُؤْمِنُونَ
[7:203]
And when you bring them not a revelation they say: Why do you not forge it? Say: I only follow what is revealed to me from my Lord; these are clear proofs from your Lord and a guidance and a mercy for a people who believe.
If thou bring them not a revelation, they say: "Why hast thou not got it together?" Say: "I but follow what is revealed to me from my Lord: this is (nothing but) lights from your Lord, and Guidance, and mercy, for any who have faith."
And when thou bringest not a verse for them they say: Why hast thou not chosen it? Say: I follow only that which is inspired in me from my Lord. This (Qur'an) is insight from your Lord, and a guidance and a mercy for a people that believe.