4512 Pervert the Truth in Our Signs: either by corrupting the scriptures or turning them to false and selfish uses; or by neglecting the Signs of Allah in nature around them, or silencing His voice in their own conscience. Everything is known to Allah. Why not work for true salvation at the final Judgement?
8 This refers to the noise the disbelievers used to make when the Quran was recited (see 41:26), or those who twist the meaning of Quranic passages and take them out of context.