Holy Prophet Muhammad al Mustafā (salla llāhu ʿalayhi wa-alehe wa-sallam) said:
“...[after Husain (alayhi salām)’s martyrdom] Iblis (la'natullah alayha) will fly around the earth on that day joyfully, along with his devils and demons. And call out to them: O devils! We have truly achieved our goal with the children of Adam. We have attained our target in their destruction and we have caused them all to inherit Hell, except those who stay committed to this group referring to Imām Husain (alayhi salām) and his companions.
So focus your efforts in creating doubts among the people about them [the Ahle Bayt (alayhimus salām)] and in inciting animosity towards them. Lure the people away from them and their followers so that you can strengthen deviation and disbelief of the people and so that no one survives...."
[Reference: Kamiluz Ziyaraat, Chapter 88, page 287]