(Al-Hajj) 22 : 11
وَمِنَ النَّاسِ مَنْ يَعْبُدُ اللَّهَ عَلَىٰ حَرْفٍ ۖ فَإِنْ أَصَابَهُ خَيْرٌ اطْمَأَنَّ بِهِ ۖ وَإِنْ أَصَابَتْهُ فِتْنَةٌ انْقَلَبَ عَلَىٰ وَجْهِهِ خَسِرَ الدُّنْيَا وَالْآخِرَةَ ۚ ذَٰلِكَ هُوَ الْخُسْرَانُ الْمُبِينُ
And there are among mankind who serve Lord Allah on an edge; then if he is touched by good, he is tranquil with it; then if he is struck by sedition, he turns back from His Face. He lost both this world and the Hereafter, that is the manifest loss.
The character of aimless and heedless Arabic Quran reading Fujjar who hide and reject Adhikr is portrayed in this verse. The believer endowed with intelligence who testifies Adhikr will only remember Lord with soul always as explained in verse 17: 83. See explanation 2: 152 and 18: 32-42.