Musnad Abu Ya'la al-Mawsili 228:4

Muhammad ibn al-Khattab narrated to us, al-Jaddi narrated to us, Shu'bah informed us, from Sa'd ibn Ibrahim, from Muhammad ibn 'Abd al-Rahman, who said: I heard my uncle narrating from the Prophet, peace and blessings of Allah be upon him, that he said: "Whoever hears the call on the day of Friday and does not come or does not answer, then hears the call and does not come or does not answer, then hears the call and does not come or does not answer, Allah—Mighty and Majestic is He—seals his heart and makes it the heart of a hypocrite."