Fussilat 41:42

La ya/teehi albatilu min bayniyadayhi wala min khalfihi tanzeelun min hakeemin hameed

Falsehood cannot approach it from before it or from behind it; [it is] a revelation from a [Lord who is] Wise and Praiseworthy.

that cannot be approached by falsehood, neither from its front, nor from its behind -a revelation from the All-Wise, the Ever-Praised.