Surely Allah is not ashamed to set forth any parable-- (that of) a gnat or any thing above that; then as for those who believe, they know that it is the truth from their Lord, and as for those who disbelieve, they say: What is it that Allah means by this parable: He causes many to err by it and many He leads aright by it! but He does not cause to err by it (any) except the transgressors,

Rasul Allah (sal Allahu alaihi wa sallam) said: “The first matter concerning which people will be judged on the Day of Resurrection will be the matter of blood.” [Sahih Muslim]