Holy Qur’an 4:156

Then, because of their breaking of their covenant, and their denial of the Signs of Allah, and their seeking to kill the Prophets unjustly, and their saying: ‘Our hearts are wrapped in covers,’—nay, but Allah has sealed them because of their disbelief, so they believe not but little—

Translation: Maulawi Sher Ali (Ahmadiyya Muslim Jamaat)

Surah 4: An-Nisa