Abstract: The previous parts offered and explanation on the close connection between Imam Husayn and Imam Mahdi in hadiths and why Imam Mahdi refers much to Imam Husayn in his universal mission for establishment of Justice while putting the demand for the blood of Imam Husayn at top of his agenda. This part offers guidelines as to how a person can help Imam Mahdi by being a good follower of Imam Husayn. It will be argued that by showing the people the value of being a good follower of Imam Husayn, and in particular by showing complete commitment to observing and to establishing justice and other virtues, one can prove his love for Imam Husayn while simultaneously helping Imam Mahdi.