This Ziarat is for 1st Rajab, 15th Rajab and 15th Sha'baan. It is related from Imam Sadiq (a.s.) that one who performs the Ziarat of Imam Hussein (a.s.) on 1st Rajab would be forgiven by Allah. It is narrated from Ibne Abi Nasr that he asked Imam Rida (a.s.) what was the best time for the Ziarat of Imam Hussein (a.s.). He (a.s.) replied: 15th Rajab and 15th Sha'baan.
Shaykh Mufeed (a.r.) and Sayyid Ibne Taaoos (r.a.) have mentioned that this Ziarat is for 1st Rajab and 15th Shabaan, but Shaheed (r.a.) has prescribed it for 1st eve of Rajab, eve and day of 15th Rajab and 15th Sha'baan. Thus according to him this Ziarat is for six occasions. The method of this Ziarat is like this: When you want to perform the Ziarat of Imam Hussein (a.s.) on these occasions, perform ghusl, wear ritually pure clothes and stand at the door of the Shrine facing the qibla and salute the Holy Prophet (s.a.w.a.), Ali (a.s.), Hazrat Fatemah (a.s.), Imam Hasan (a.s.) and Imam Hussein (a.s.) and other Imams (a.s.). After this recite the dua for permission to enter and then enter. Stand near the Zari and say ALLAAHO AKBAR 100 times. Then recite:
Peace be on you, O the son of the Messenger of Allah!
Peace be on you, O the son of the Last Prophet!
Peace be on you, O the son of the Messenger-in-Chief !
Peace be on you, O the son of the first successor! Peace be on you, O Aba Abdillah!
Peace be on you, O Hussein bin Ali!
Peace be on you, O the son of Fatimah Zahra, the leader of the women of the worlds! Peace be on you, O the intimate friend of Allah, and the son of His intimate friend! Peace be on you, O the sincere servant of Allah, and the son of His sincere servant!
Peace be on you, O the evident proof of Allah. and the son of His evident proof ! Peace be on you, O the dearest beloved of Allah, and the son of His dearest beloved! Peace be on you, O the representative of Allah, and the son of His representative! Peace be on you, O the custodian of the record wherein deeds are put in black and white!
Peace be on you, O the inheritor of the Tawrayt, Injeel, and Zuboor!
Peace be on you, O the administrator of the divine mercy! Peace be on you, O the part and parcel of the Holy Quran!
Peace be on you, O the pivot of the religion of Allah!
Peace be on you, O the gateway to the wisdom of the Lord of the worlds!
Peace be on you, O the door of salvation through which whoso is allowed to enter gets amnesty!
Peace be on you, O the treasure of the divine knowledge! Peace be on you, O the depository of the confidential and privileged matters of Allah!
Peace be on you, O he whose blood-claimer is Allah, He is the blood-claimer of your father also, as those who persecuted you, your relatives and friends have not been punished for their crimes.
Peace be on you, and on the souls of those who came and stayed with you in your camp for good.
I, my father and mother are at your disposal O Aba Abdillah Verily, terrible was the calamity , and your suffering casts gloom upon us and on all the Muslims So, curse of Allah be on those who planted the seeds of hostility persecution and organized cruelty to crush you and your family Curse of Allah be on those who took away your rightful office from you, and set aside your authority. consolidated by Allah. I, my father and mother are at your disposal O Aba Abdillah!
I bear witness that, verily, the foundation of the Arsh shuddered and jolted when your blood spilled over the sand and every living being shivered and trembled; the heavens and the earth, the dwellers of Paradise, the inhabitants of land and waters, one and all, were in tears, sad and troubled.
Blessings of Allah be on you, count and measure of which Allah alone knows.
Here I am for your service O he who invited the people unto Allah.
Although I could not put myself (bodily) at your disposal when you asked for help, and could not declare my readiness to help you when you sought support, but my mind and soul, my understanding and insight, are at your beck and call.
Glory be to our Lord, that the promise of our Lord is certainly fulfilled I bear witness that you are pure purity purified; and the offspring of purified pure purity, you are pure and the land where you are present is rendered pure, and the earth wherein you are resting has been purified, and also your Holy “Haram”. I bear witness that, verily, you justly and fairly dealt with people, and advised them to adhere to justice and fairplay. Verily, you are the truthful who kept his word, told the truth and proved true that unto which you invited the people.
Verily, you stood up for Allah in the earth, I bear witness that, verily you fulfilled the task for which you were commissioned by Allah by your grandfather, the Messenger of Allah, by your father, the Ameerul Momineen by your brother, Hasan; gave sincere advice and strived the way of Allah, till the inevitable came unto you Therefore, Allah rewarded you the best reward ever won and indeed blessed you and greeted you.
O Allah send blessings on Muhammad and on the children of Muhammad, and send blessings on the much wronged martyr, Hussein, who showed the right path, who bathed in tears, whom sorrows surrounded from all sides, growing, prompt and multiplying blessings, let its beginning begin from the highest height, do not let there be a beginning or the end of its ceaseless course much and more blessings that Thou had bestowed on any the children of Thy prophets and Messengers. O the God of the worlds.
Now kiss the holy grave and place your right cheek on the grave, then place your left cheek upon it, circle the grave and kiss all around it. Shaykh Mufeed (a.r.) says: After this go to the grave of Ali bin Hussein (a.s.) and standing at his grave recite:
Peace be upon you; O the veracious, the pure,
The immaculate, the dear, the favorite,
The son of the basil of Allah’s Messenger.
Peace be upon you; as you are steadfast martyr;
Allah’s mercy and blessings be upon you.
How noble is your position and how honorable is your seat.
I bear witness that Allah thanked you for your efforts,
And He magnified your rewards,
And he joined you to the exalted summit
Where there is the entire honor
In the elevated chambers.
Similarly, He had bestowed upon you and made you one of the Household of the Prophet
From whom Allah removed filth and whom He purified with thorough purification.
Allah’s blessings and mercy and benedictions and pleasure be upon you.
So, O the pure master; (please) intercede for me before your Lord
So that He may unburden and relieve me from the loads (of sins) that I carry on my back.
And (please) have mercy upon my humbleness and submission to you and to the master, your father. May Allah bless you both.
Touch your body to the purified grave and say:
May Allah increase your honor in the Hereafter
In the same way as He honored you in this world
And may He bless you in the same way as He blessed others on account of you.
And I bear witness that you are the signposts of the religion
And the stars of the worlds.
Peace and Allah’s mercy and blessings be upon you
After this turn your attention to the other martyrs of Kerbala and say:
Peace be upon you (all); O the supporters of Allah
And the supporters of His Messenger,
And the supporters of `Ali ibn Abi-Talib
And the supporters of Fatimah,
And the supporters of al-Hasan and al-Hussein,
And the supporters of Islam.
I bear witness that you indeed did sincerely for the sake of Allah,
And you strove sincerely in His way.
So, may Allah reward you on behalf of Islam and its people with the best of rewarding.
By Allah I swear, you did win a great success.
I wish I were with you so that I would win a great success.
I bear witness that you are alive with your Lord, receiving sustenance.
I bear witness that you are the true martyrs and the true happy ones.
And you are the winners in the most elevated ranks.
Peace and Allah’s mercy and blessings be upon you
After this come back and stand at the head of the Imam's grave and pray 2 rakat like fajr prayers Ziarat and pray for self, the parents and other believers.