one night Imam Husayn (a.s.) stepped out of his house and went to the head of the grave of his Grandfather and said,
“Salutations be upon you O Prophet of Allah! I am Husayn the son of Fatima (a.s.). I am your beloved and the child of your beloved. I am your son whom you have left as your heir among your ummah. Thus O Prophet of Allah! Be a witness that these people have deserted me and neglected me while refusing to protect me. This is my complaint to you until I come to your presence.”
Then he arose and started reciting the Prayers, constantly bowing and prostrating. Waleed went to his house to inquire whether the Imam had left Madina or no. When he saw that the Imam was not there he said, “Thanks to Allah that he has left and I have been saved from being indicted and involved in spilling his blood.” Then Imam returned back to his home and on the second night he again went to the grave of the Holy Prophet (S) and recited some units of Prayers. After finishing the Prayers he said,
“O Allah! This is the grave of Your Prophet, and I am the grandson of Your Prophet. You are aware as to what has befallen me. Verily I cherish virtue and righteousness and abhor evil. O Lord of Glory and Honor! I adjure You by the right of this grave and the one who is buried therein, to bring forth for me that which is approved by You and Your Prophet.”
Imam continued weeping until the morning, then he placed his head on the grave and slept for a short time. He dreamt that the Prophet (S), surrounded by the Angels from the left, right and front, coming towards him. The Prophet came near and pressed Imam Husayn (a.s.)’s head to his chest. Then he kissed him between his eyes and said,
“O my beloved Husayn! It is as if I see you smeared in blood at the place of grief and trials, and a group from among my people have beheaded you, and you are thirsty while they do not quench your thirst. In spite of this they desire my intercession (on the day of Qiyamah). May Allah keep them away from my intercession. O my beloved Husayn! Your Father, Mother and Brother have come to me and they are desirous of meeting you. And you have acquired such a lofty position in Paradise, that unless you attain Martyrdom you shall not get there.”
Imam looked at his Grandfather and said,
“O Grandfather! I do not desire to return back to this world. Please take me along with you and enter me into your grave.”
The Prophet replied,
“You should return back (towards the world) and attain Martyrdom, and thus gain whatever great rewards Allah has reserved for you. For on the day of Qiyamah, you, your Father, your Uncle and Yours Father’s Uncle shall arise as a distinguished group until you all enter Paradise.”
Imam Husayn (a.s.) arose from his sleep alarmed and narrated his dream to his family and the progeny of Abdul Muttalib. On that day no one in the world was more grievous and sorrowful than the family of the Holy Prophet (S).
Thus, Imam Husayn (a.s.) started making preparations for the journey. During midnight he went to the graves of his Mother Hazrat Fatima (a.s.) and his Brother Imam Hasan (a.s.) to bid them farewell.
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)