The Messenger of Allah ﷺ said: "Whoever misses jumu'ah three times with no cogent excuse, Allah (SWT) will place a seal on his heart." (Using translation from Nasāʾī 1369-2)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ تَرَكَ الْجُمُعَةَ ثَلَاثَ مِرَاتٍ مِنْ غَيْرِ ضَرُورَةٍ طُبِعَ عَلَى قَلْبِهِ