He also recalled a past instance in which Osama bin Laden called on al-Qaeda members and supporters to give allegiance to Abu Omar al-Baghdadi when the group was still solely operating in Iraq , as the Islamic State of Iraq , and condemned Ayman al-Zawahiri for not making this same claim for Abu Bakr al-Baghdadi , and that Zawahiri was encouraging factionalism and division between former allies of ISIL such as the al-Nusra Front .