He heard Ibn Abbas and Ibn Umar narrate that while he was on the minbar, the Messenger of Allah ﷺ said: "People should stop neglecting Jumu'ah or Allah will place a seal on their hearts and they will be deemed as being among the negligent."
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ وَهُوَ عَلَى أَعْوَادِ مِنْبَرِهِ لَيَنْتَهِيَنَّ أَقْوَامٌ عَنْ وَدْعِهِمُ الْجُمُعَاتِ أَوْ لَيَخْتِمَنَّ اللَّهُ عَلَى قُلُوبِهِمْ وَلَيَكُونَنَّ مِنَ الْغَافِلِينَ