Khutba 12 - The hypocrites amongst us - Part 2 - Abdullah Ibn Ubai & Uhud - Kaan Abdul Hakam

Major hypocrisy = An outward display of faith in Allah, His Angels, His Books, His Messengers and the Last Day whereas inwardly one is devoid of such belief, disbelieving in it.
[Taken from Ibn al Qayyim RA book "Sifat al-Munafiqin", Page 16]