The Prophet ﷺ said: He who leaves the Friday prayer (continuously) for three Friday on account of slackness, Allah will print a stamp on his heart. (Using translation from Abū Dāʾūd 1052)   

عَنْ أَبِي الْجَعْدِ الضَّمْرِيِّ وَكَانَتْ لَهُ صُحْبَةٌ قَالَ قَالَ رَسُولُ اللهِ ﷺ مَنْ تَرَكَ ثَلَاثَ جُمَعٍ تَهَاوُنًا مِنْ غَيْرِ عُذْرٍ طَبَعَ اللهُ عَلَى قَلْبِهِ