It is narrated from Sayyiduna Abu al-Ja'd al-Damri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever abandons three Fridays out of negligence, Allah sets a seal upon his heart."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19119