And of mankind is he who purchases idle talk (Lahw Al-Hadith) to mislead from the path of Allah without knowledge, and takes it by way of mockery. For such there will be a humiliating torment (6)And when Our Ayat are recited to such a one, he turns away in pride, as if he heard them not – as if there were deafness in his ear. So announce to him a painful torment (7)

The Doomed are preoccupied with Idle Talk and They turn away from the Ayat of Allah

When Allah mentions the blessed – who are those who are guided by the Book of Allah and benefit from hearing it, as He says:

اللَّهُ نَزَّلَ أَحْسَنَ الْحَدِيثِ كِتَابًا مُتَشَابِهًا مَثَانِيَ تَقْشَعِرُّ مِنْهُ جُلُودُ الَّذِينَ يَخْشَوْنَ رَبَّهُمْ ثُمَّ تَلِينُ جُلُودُهُمْ وَقُلُوبُهُمْ إِلَىٰ ذِكْرِ اللَّهِ ۚ

(Allah has sent down the Best Statement, a Book, its parts resembling each other (and) oft-repeated. The skins of those who fear their Lord shiver from it. Then their skin and their heart soften to the remembrance of Allah)(39:23). He connects that with mention of the doomed, those who turn away from the Qur'an and do not benefit from hearing the Words of Allah. Instead, they turn to listening to flutes and singing accompanied by musical instruments. As Ibn Mas'ud commented about the Ayah:

وَمِنَ النَّاسِ مَنْ يَشْتَرِي لَهْوَ الْحَدِيثِ لِيُضِلَّ عَنْ سَبِيلِ اللَّهِ

(And of mankind is he who purchases Lahu Al-Hadith to mislead (men) from the path of Allah), he said, "This – by Allah – refers to singing."

وَمِنَ النَّاسِ مَنْ يَشْتَرِي لَهْوَ الْحَدِيثِ لِيُضِلَّ عَنْ سَبِيلِ اللَّهِ بِغَيْرِ عِلْمٍ 

(And of mankind is he who purchases Lahw Al-Hadith to mislead (men) from the path of Allah without knowledge,) Qatadah said: "By Allah, he may not spend money on it, but his purchasing it means he likes it, and the more misguided he is, the more he likes it and the more he prefers falsehood to the truth and harmful things over beneficial things." It was said that what is meant by the words

يَشْتَرِي لَهْوَ الْحَدِيثِ

(purchases idle talks) is buying singing servant girls. Ibn Jarir said that it means all speech that hinders people from seeing the signs of Allah and following His path. His saying:

لِيُضِلَّ عَنْ سَبِيلِ اللَّهِ

(to mislead (men) from the path of Allah) means, he does this to oppose Islam and its followers.

وَيَتَّخِذَهَا هُزُوًا

(and takes it by way of mockery.) Mujahid said, "This means mocking the path of Allah and making fun of it."

أُولَٰئِكَ لَهُمْ عَذَابٌ مُهِينٌ

(For such there will be a humiliating torment.) Just as they showed no respect to the signs and path of Allah, so they will be shown no respect on the Day of Resurrection, and they will be subjected to a painful, ongoing torment. Then Allah says:

وَإِذَا تُتْلَىٰ عَلَيْهِ آيَاتُنَا وَلَّىٰ مُسْتَكْبِرًا كَأَنْ لَمْ يَسْمَعْهَا كَأَنَّ فِي أُذُنَيْهِ وَقْرًا ۖ 

(And when Our Ayat are recited to such a one, he turns away in pride, as if he heard them not – as if there were deafness in his ear.) means, when these Qur'anic verses are recited to one who is fond of idleness and play, he turns away from them and does not want to hear them. He turns a deaf ear to them as if he can hear nothing, because it annoys him to hear them since he gains no benefit from them and has no interest in them.

فَبَشِّرْهُ بِعَذَابٍ أَلِيمٍ

(So announce to him a painful torment.) i.e., on the Day of Resurrection, which will hurt him just as much as listening to the Book of Allah and its verses hurt him.