سُورَةُ الأَعۡرَافِ

And yet, when thou [O Prophet] dost not produce any miracle for them, some [people] say, "Why dost thou not seek to obtain it [from God]? Say: "I only follow whatever is being revealed to me by my Sustainer: this [revelation] is a means of insight from your Sustainer, and a guidance and grace unto people who will believe.