وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، - قَالَ مَالِكٌ لاَ أَدْرِي أَعَنِ النَّبِيِّ صلى الله عليه وسلم أَمْ لاَ - أَنَّهُ قَالَ ‏"‏ مَنْ تَرَكَ الْجُمُعَةَ ثَلاَثَ مَرَّاتٍ مِنْ غَيْرِ عُذْرٍ وَلاَ عِلَّةٍ طَبَعَ اللَّهُ عَلَى قَلْبِهِ ‏"‏ ‏.‏

Yahya related to me from Malik that Safwan ibn Sulaym said, "Ifanyone omits jumua three times without reason or illness, Allah willset a seal on his heart." (Malik said, "I don't know if it was fromthe Messenger of Allah, may Allah bless him and grant him peace, ornot.") Translation Not Available

Book Ref: Muwatta Imam Malik Book 5 Hadith 245
Web Ref:  Muwatta Imam Malik Book 5 Hadith 22