Imam Ali (AS) said:
Swear to my own life, I do not compromise and show weakness in fighting those who are against the truth, and those who are sunk in corruption and are in a state of being misled. Then, O’ the servants of God, fear God and escape from God to God, and strive in the ways that God has opened for you, and observe duties and rules which God has designated for you. If you do so, Ali (AS) is the guarantor of your victory in the future, even if you do not gain it now [1].
[1] Nahjul Balaghah, Sermon 24.
Source: en.shafaqna.com