As he was asked whether jihad is obligatory or recommendable, Imam Al- Husayn (‘as) answered:
Jihad is of four forms—two are obligatory, one is recommendable but performed only with the obligatory, and one is independently recommendable. One of the two obligatory jihads is self-control against committing acts of disobedience to God. It is surely the greatest form of jihad. The other obligatory jihad is fighting the near disbelievers. The jihad that is recommendable but performed only with the obligatory is fighting the enemy. It is obligatory upon everybody. If they neglect fighting the enemies, punishment will befall them. Meanwhile, fighting the enemies is recommendable for the Imam who is permitted to fight the enemies with people. The jihad that is independently recommendable is every (good) tradition that a man founds and exerts efforts for instituting, achieving, and enlivening it. Activities and efforts that are exercised for achieving such traditions are the best deeds because they represent the restoration of the traditions. The Prophet (SAW) said: He who introduces a good tradition will be gaining the reward of that tradition in addition to the rewards of everybody who follows it up to the Day of Resurrection without any imperfection in their rewards.