Abū ‘Abdillāh (Imam Sādiq (a.s.)) said: “We announced to the children of Israel in the book: ‘You will certainly make mischief in the land twice” (17:4). The first “mischief ” refers to killing the Commander of the Believers (a.s.) and the second “mischief” refers to stabbing Ḥasan ibn ‘Ali (a.s.). “And you will certainly become exceedingly arrogant” (17:4) refers to killing Ḥusain ibn ‘Ali (a.s.). “So, when the promise of the nearest to the two came” (17:5) refers to (the time) when the avenger of the blood of Ḥusain (a.s.) will come. “We sent over you Our servants who possessed terrible prowess; so they invaded the very inmost parts of your houses” (17:5) refers to a group of people who will rise before the time of the Qā`im (a.s.) and who will kill anyone who has participated in spilling the blood of the members of the family of Muḥammad (s.a.a.w.). “And it was a warning (completely) fulfilled” (17:5).