Do not eat that (meat) over which the name of Allah has not been pronounced. This is surely a sin. The satans inspire their friends to dispute with you. If you were to obey them, you would be Mushriks.
Is it (conceivable) that the one who was dead and to whom We gave life, and set for him a light with which he walks among men, (is held to) be like the one whose condition is such that he is in total darkness, never coming out of it? This is how their deeds appear beautified to the disbelievers.
In a similar way, in every town We caused its chief sinners to commit mischief in it. And they do not commit mischief but against themselves, while they do not realize it.
When a sign comes to them, they say, “We shall never come to believe unless we are given the like of what was given to the messengers of Allah.” Allah knows best where to place His message. Those who committed sin shall soon suffer from disgrace before Allah and face severe punishment for the mischief they have been making.
So, whomsoever Allah wills to guide, He makes his heart wide open for Islam, and whomsoever He wills to let go astray, He makes his heart strait and constricted, (and he feels embracing Islam as difficult) as if he were climbing to the sky. In this way, Allah lays abomination on those who do not believe.