Al-Hajj 22:11

There are some people who worship Allah on the edge [of faith][6]: if something good comes to them, they are content; but if they are afflicted with a trial, they turn back[7], thus losing both this world and the Hereafter. That is the evident loss.

[6] i.e., with uncertainty, hypocrisy, or heedlessness.
[7] lit., they tumble on their faces, i.e., turn back to disbelief.

And of the people is he who worships Allāh on an edge.[917] 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.

[917] At the edge of his religion, so to speak, i.e., with uncertainty, hypocrisy or heedlessness.

11. And among mankind is he who worships Allâh as it were, upon the edge (i.e. in doubt): if good befalls him, he is content therewith; but if a trial befalls him, he turns back on his face (i.e. reverts to disbelief after embracing Islâm). He loses both this world and the Hereafter. That is the evident loss.

And among mankind is he who worshippeth Allah upon a narrow marge so that if good befalleth him he is content therewith, but if a trial befalleth him, he falleth away utterly. He loseth both the world and the Hereafter. That is the sheer loss.