He calls on Muslims to “strike terror from within.” To “strike terror” is a Qur’anic imperative: “Against them make ready your strength to the utmost of your power, including steeds of war, to strike terror into (the hearts of) the enemies, of God and your enemies…” (Qur’an 8:60).
Note that he also says that the jihadis love death more than non-Muslims love life. This, too, is based on the Qur’an: “Say (O Muhammad): O ye who are Jews! If ye claim that ye are favoured of Allah apart from (all) mankind, then long for death if ye are truthful.” — Qur’an 62:6