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fa-qātil fī sabīli llāhi lā tukallafu ʾillā nafsaka wa-ḥarriḍi l-muʾminīna ʿasā llāhu ʾan yakuffa baʾsa lladhīna kafarū wa-llāhu ʾashaddu baʾsan wa-ʾashaddu tankīlan
So fight in the way of Allah: you are responsible only for yourself, but urge on the faithful [to fight]. Maybe Allah will curb the might of the faithless, for Allah is greatest in might and severest in punishment.
— Ali Quli Qarai
Surah An-Nisa', Verse 84
84. "So, fight in the way of Allah; you are charged only with yourself, and encourage the believers may be Allah will restrain the might of those who disbelieve. Verily Allah is the strongest in might and the severest in punishment."
When the pagans won the Battle of 'Uhud, Abu-Sufyan proudly said that he would encounter the Muslims again at Badri-Suqra (a market used to be held in the month Zilqa'dah at a land called Badr). Before the appointed time, the holy Prophet (S) invited people for the Holy struggle. There came seventy strivers, but no conflict happened and Muslims returned to Medina safely. Therefore, a leader should move in front of others when there is a danger. So, if it happens that the Muslims pay no attention to the call of the oppressed, the leader should act by himself.
The command unto the Prophet (S) enjoining that even when he is alone he should fight against the enemy, is 'a single commandment '.
"Encourage the believers maybe Allah will restrain the might of those who disbelieve. Verily Allah is the strongest in might and the severest in punishment."