Hadithcore
Sahih Muslim, 865
sahih

Abdullah b. Umar and Abu Huraira said that they heard Allah's Messenger (ﷺ) say on the planks of his pulpit:

People must cease to neglect the Friday prayer or Allah will seal their hearts and then they will be among the negligent.

وَحَدَّثَنِي الْحَسَنُ بْنُ عَلِيٍّ الْحُلْوَانِيُّ، حَدَّثَنَا أَبُو تَوْبَةَ، حَدَّثَنَا مُعَاوِيَةُ، - وَهُوَ ابْنُ سَلاَّمٍ - عَنْ زَيْدٍ، - يَعْنِي أَخَاهُ - أَنَّهُ سَمِعَ أَبَا سَلاَّمٍ، قَالَ حَدَّثَنِي الْحَكَمُ بْنُ مِينَاءَ، أَنَّحَدَّثَاهُ أَنَّهُمَا، سَمِعَا رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ عَلَى أَعْوَادِ مِنْبَرِهِ ‏

‏ لَيَنْتَهِيَنَّ أَقْوَامٌ عَنْ وَدْعِهِمُ الْجُمُعَاتِ أَوْ لَيَخْتِمَنَّ اللَّهُ عَلَى قُلُوبِهِمْ ثُمَّ لَيَكُونُنَّ مِنَ الْغَافِلِينَ ‏

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References2 variants
In-Book Reference
Book 7, Hadith 52
USC-MSA web (English) reference
Book 4, Hadith 1882 (deprecated numbering scheme)
Sharh · explanationclick to expand
The Friday prayer is of great significance in Islam. Allah Almighty made it obligatory for non-traveling men to go out for it when the Muezzin makes the Adhān, calling for it, and He urged them to attend this prayer and warned against neglecting it. An example is this Hadīth in which the Prophet (may Allah's peace and blessings be upon him) said: "Either some people stop abandoning the Friday prayers," i.e., they abandon and fail to perform it out of negligence and laziness, without an excuse. If they do not comply and attend the Friday prayer, Allah will seal their hearts, by putting a seal and cover over them, and deny them His grace and bounty and place in them ignorance, roughness, and hardness. "and then they will be among the heedless" away from doing the deeds that benefit them and leaving what harms them. Thus, they will be among those overtaken by heedlessness, as they forgot Allah, and so He forgot them. This serves as a strong deterrent against the abandonment and neglect of the Friday prayer..
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