﴿ وَمِنَ ٱلنَّاسِ مَن يَعْبُدُ ٱللَّهَ عَلَىٰ حَرْفٍۢ ۖ فَإِنْ أَصَابَهُۥ خَيْرٌ ٱطْمَأَنَّ بِهِۦ ۖ وَإِنْ أَصَابَتْهُ فِتْنَةٌ ٱنقَلَبَ عَلَىٰ وَجْهِهِۦ خَسِرَ ٱلدُّنْيَا وَٱلْءَاخِرَةَ ۚ ذَٰلِكَ هُوَ ٱلْخُسْرَانُ ٱلْمُبِينُ ﴾

“And there is, too, among men many a one who worships God on the border-line [of faith]: thus, if good befalls him, he is satisfied with Him; but if a trial assails him, he turns away utterly, losing [thereby both] this world and the life to come: [and] this, indeed, is a loss beyond compare!”

(And among mankind is he who worshippeth Allah upon a narrow marge) and among people there is he who worships Allah on an experimental basis, in doubt and because of expectation of some benefit. This was revealed about the Banu'l-Hallaf, the hypocrites of the Banu Asad and Ghatafan, (so that if good) a bounty (befalleth him he is content therewith) he is pleased with the religion of Muhammad (pbuh) but just with his tongue, (but if a trial) hardship (befalleth him, he falleth away utterly) he reverts to his first religion: associating partners with Allah. (He loseth both the world) by missing the life of this world (and the Hereafter) by losing Paradise. (That is the sheer loss) the loss of both this worldly life and the Hereafter.