Tafsir of Al-A'raf 7:186

Allah said next,

من يضلل الله فﻼ هادي له

ويذرهم في طغيانهم يعمهون

Whomsoever Allah sends astray, none can guide him; and He lets them wander blindly in their transgressions. Allah says, those who were destined to be misguided, then none can lead them to guidance, and even if they try their best effort to gain such guidance, this will not avail them,

ومن يرد الله فتنته فلن تملك له من الله شييا

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,

قل انظروا ماذا فى السموت واﻻرض وما تغنى اﻻيت والنذر عن قوم ﻻ يومنون

Say: "Behold all that is in the heavens and the earth,'' but neither Ayat nor warners benefit those who believe not. (10:101)