Abu Bakr al-Baghdadi, the leader of the Islamic State, appeared for the first time in a video, delivering a sermon at the Great Mosque in the city of Mosul in Iraq’s Ninawa province.

In his first message as Caliph, Abu Bakr al-Baghdadi highlighted an overlooked danger that foreign fighters pose to their home countries.

Islamic State of Iraq and al-Sham (ISIS) spokesman Abu Muhammad al-‘Adnani’s 34-minute speech titled “This is the Promise of Allah”—which declares ISIS as Caliphate under the name “Islamic State,” along with ISIS leader Abu Bakr al-Baghdadi’s status as the Caliph—has reignited the recently quieted conflict between ISIS, al-Qaeda (AQ), and AQ’s Syrian branch, al-Nusra Front.