Surah Al-Hajj, Verse 11

وَمِنَ ٱلنَّاسِ مَن يَعۡبُدُ ٱللَّهَ عَلَىٰ حَرۡفٖۖ فَإِنۡ أَصَابَهُۥ خَيۡرٌ ٱطۡمَأَنَّ بِهِۦۖ وَإِنۡ أَصَابَتۡهُ فِتۡنَةٌ ٱنقَلَبَ عَلَىٰ وَجۡهِهِۦ خَسِرَ ٱلدُّنۡيَا وَٱلۡأٓخِرَةَۚ ذَٰلِكَ هُوَ ٱلۡخُسۡرَانُ ٱلۡمُبِينُ١١

wamina l-nāsi man yaʿbudu l-laha ʿalā ḥarfin fa-in aṣābahu khayrun iṭ'ma-anna bihi wa-in aṣābathu fit'natun inqalaba ʿalā wajhihi khasira l-dun'yā wal-ākhirata dhālika huwa l-khus'rānu l-mubīnu

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