"Allah the Almighty has said: Whosoever acts with enmity towards a closer servant of Mine (wali), I will indeed declare war against him. Nothing endears My servant to Me than doing of what I have made obligatory upon him to do. And My servant continues to draw nearer to Me with supererogatory (nawafil) prayers so that I shall love him. When I love him; I shall be his hearing with which he shall hear, his sight with which he shall see, his hands with which he shall hold; and his feet with which he shall walk. And if he asks (something) of Me I shall surely give it to him, and if he takes refuge in Me; I shall certainly grant him it."

Al Bukhari