Surah Al-Hajj, ayah 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 ٱلۡمُبِينُ ١١

Waminan-nāsi man ya'budullāha 'alā harfin fa in asābahū khayrunitma'anna bihī wa in asābathu fitnatuninqalaba 'alā wajhihī khasirad-dunyā wal-ākhirata dhālika huwal-khusrānul-mubīn

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.