Al-A'raaf - Ayah 186

وَمَن يُرِدِ اللَّهُ فِتْنَتَهُ فَلَن تَمْلِكَ لَهُ مِنَ اللَّهِ شَيْئاً (And whomsoever Allah wants to put in Fitnah (error, because of his rejecting of Faith, or trial), you can do nothing for him against Allah) 5:41, and, قُلِ انظُرُواْ مَاذَا فِى السَّمَـوَتِ وَالاٌّرْضِ وَمَا تُغْنِى الآيَـتُ وَالنُّذُرُ عَن قَوْمٍ لاَّ يُؤْمِنُونَ (Say: "Behold all that is in the heavens and the earth," but neither Ayat nor warners benefit those who believe not) 10:101.