Worshiping On a Edge (In-and-Out) to Turning on Their Faces (Disbelief)

And of the people is he who worships Allah on an edge.¹ If he is touched by good, he is reassured by it; but if he is struck by trial, he turns on his face [to unbelief]. He has lost [this] world and the Hereafter. That is what is the manifest loss.

— Saheeh International