It is the fortieth day after Imam Hussain (asws)’s martyrdom. According to both Sheikh Tusi and Sheikh Saduq it is the day when the household members of Imam Hussain (asws) came back to Medina from Shaam, and it is the day when Jabir ibn Abdullah al-Ansari went to Karbala to make ziarat to Imam Hussain (asws)’s holy grave. Actually, he was the Imam (asws)’s first pilgrim. So it is recommended to go on ziarat to his holy shrine on this day. Imam Hasan `Askari (asws) was quoted as saying, “A believer holds five characteristics: saying 51 rak`ats of obligatory and recommended prayers within 24 hours, reciting the ziyarat of al-Arba`in, wearing ring in the right hand, putting one’s forehead on earth when observing prostration, and saying “In the Name of Allah, the Compassionate, the Merciful” (bismillahir rahmanir rahim) loudly. “
The manner of performing the ziarat of Imam Hussian (asws) is cited in Tahdhib al-Ahkam and Misbah al-Mutahajjid from Safwan al-Jammal: Safwan said that regarding the ziarat of Arba`een his master, Imam Sadiq (asws) had told him, “Perform the ziarat in the middle hour of the forenoon by reciting:” (the following is the ziarat of arbaeen)
Peace be upon the Wali of Allah and His most beloved! Peace be on the beloved friend of Allah, His distinguished!
Peace be on the chosen of Allah and son of His Chosen! Peace be on Hussain (asws), al Mazloom (oppressed) al Shaheed (martyr)!
Peace be on the captive of afflictions, and the killed with flowing tears.
0 Allah I testify He is Your Wali and Son of Your Wali and Your Chosen and Son of Your Chosen who is victorious by Your Might!
You honored Him with martyrdom and bestowed upon Him prosperity. You choose for Him Purified Parents
And You made Him one a masters from the masters, and a leader from the leaders, and a defender of rights from the defender of rights and You gave the inheritance of the Prophets (as)
And You made Him as a Hujjat (proof) upon Your creation from the Successors. And in invitation He left no room for excuse and preached without hesitation
And gave His life in Your way to save Your servants from the yoke of ignorance and the evil of misguidance
And took pride in insolence, threw himself into his desires, and displeased You and Your Prophet (saw)
And obeyed from Your servants those who sow discord and hypocrisy and the bearers of sins who were condemned to Hellfire
He (the Holy Imam asws) fought them for You with patience until in Your obedience His blood was spilled and His sanctity shattered
0 Allah, send lanaat upon them with extreme force and chastise them with a painful chastisement
Peace be on you 0 the son of RasoolAllah (saw)!
Peace be on you 0 the son of Master of Successors!
I testify that Allah will indeed fulfill the promise He made to You and will destroy those who abandoned You and will punish those who killed You
I testify that You fulfilled Your promise to Allah and fought in His way until You departed from this world,
May the lanaat of Allah be on those who martyred you, may the lanaat of Allah be on those who oppressed you, may lanaat of Allah be on the people who came to know and were pleased upon hearing it
0 Allah be my witness that I make friends with those who love him and oppose those who deny him.
May my parents be sacrificed on You, 0 Son of RasoolAllah (saw)! I testify that You were noor in the sublime loins and in the pure wombs,
You were free from all the impurities of ignorance for no filth could come near You
I testify that You are the pillar of the religion, strong support of the Muslims, refuge of the momineen (believers);
I testify that You are the rightful Imam (asws), al Taqi, al Reza, al Zaki, al Hadi (guide), and al Mahdi
I testify that the Imams (asws) from Your 0ffspring are Kalimat al Taqwa (words of piety), Signs of Guidance, the firmest handle, and the Hujjat (proofs) over the people of this world
I testify that I have full faith in You, and I know for certain that You shall return. I am, fully committed to the laws of my religion and my deeds
My heart is submissive to Your heart and my affairs are in accordance with Your commands and I am ready to assist You until Allah permits you
I am with You, with You and not with Your enemies
Blessings of Allah be on you, on your souls, on your bodies, when You are visible, when You are invisible, on Your zahir (apparent), on Your batin (hidden) ameen, 0 Lord of the worlds!
Reference Mafatih al Jinan