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The Holy Prophet (pbuh) said:  یحِجُّ أغنِیاءُ أُمّتی لِلنَّزهَةِ ویحِجُّ أَوسَاطُها لِلتّجارَةِ ویحِجُّ فُقَراؤُهُم لِلرّیاءِ والسُّمعَةِ، فعِندَها یکُونُ أَقوامٌ یَتَعلّمُونَ القُرآنَ لِغیرِ اللهِ ویَتّخِذُونهُ مَزامِیرَ، ویکونُ أَقوامٌ یَتفقَّهونَ لِغیرِ اللهِ. The rich will go to Mecca for amusement, the middle-class for business, and the poor for showing off and fame. At that time, people will learn the Holy Quran for purposes other than Allah, recite it as song, and engage in learning (Islamic) jurisprudence for worldly benefits. See Tafsir al-Mizan; vol. 5 p.434 (as quoted from Tafsir al-Qummi)