Imam Hussein (as) said: Anyone who sees an oppressive sultan who considers God's prohibitions lawful and treats oppressively among the servants of God, but he does not engage in a practical and verbal struggle with him, it is right that. God brings him to the position of that oppressive king (hell)
Bahar al-Anwar, vol. 44, p. 381

Imam Hussein (as) said: [O people!] If you do not help us and do not give us our due fairly, the wrongdoers will overcome you and try to extinguish the light of your messenger, and destroy your beliefs
Tuhaf al-Uqul, vol. 1, p. 237