The city of Medina witnessed the birth of a blessed boy in the house of Lady Fatimah (A) and Imam Ali (A) on the third of Sha’ban in the year 4 after Hijra.
This newly born baby was the second son of a family whom the Prophet of Islam (S) saluted by the name of "Ahl al-Bayt" (people of the house of the Prophet). They were referred to as Ahl al-Bayt after Prophet Muhammad (S) received the verse of Tat’hir (Purification) (Quran, 33:33). His mother was Lady Fatimah (A), one of the greatest women in history, whose deep knowledge, morality, purity, and other great characteristics are well known, a mother whose rank and status is described by the Holy Quran in a whole chapter. Safia daughter of Abdul Muttalib, Asma daughter of Umais, and Um Salama were present when Imam Hussain (A) was born.
When the Prophet (A) asked Safia (his aunt) to bring him the newborn, she said: "We have not cleaned him yet." When the Prophet heard this, he (S) said: "Do you want to clean him? Surely Allah, the Exalted, has cleaned and purified him"
Asma brought the newborn to the Prophet (A). The infant was wrapped in a piece of cloth. The face of the Messenger of Allah (S) lit up upon seeing his grandson. He took him in his arms. He recited the call to prayer (adan) into his right ear, and read the shorter version (iqama) in his left ear. He, then, placed the baby in his lap and wept.
"May my father and mother be your sacrifice," Asma asked him, "why are you crying?"
"Because of this son," he (S) replied.
"He is a newborn baby," she said.
"O Asma," he (S) said, "After me, the transgressing party will mytyr him. May Allah never grant them my intercession." Then he said: "Asma, do not tell Fatima about this, for she has just given birth to him.
Hussain (A) spent his childhood with Lady Fatimah (A), Imam Ali (A), and especially with Prophet Muhammad (S). The love and affection Prophet Muhammad (S) had towards Hussain (A) was so unique that all the companions were aware of it, had frequently seen its manifestation, and had heard of it repeatedly.
Abdur Rahman bin Auf has reported that: “The Messenger of Allah (s) told me: ‘O Abdur Rahman! Do you not want me to teach you the amulet through which Prophet Ibrahim sought protection of his two sons, Ismail and Ishaq and I do for my two sons, Hasan and Husain…?
Some Traditions of Holy Prophet (S) for Imam al-Husain (AS)
The Messenger of Allah said: "Al-Hasan and al-Husain are the chiefs of the youth of Paradise and Fatimah is the chief of their women."
Also it is narrated that the Messenger of Allah said: "Husain is from me and I am from Husain."
The last part of the above tradition probably means that Imam Husain (A), by sacrificing himself and his family, preserved the religion of Prophet Muhammad (S) from full annihilation.
The Prophet (A) looked toward Ali, Hasan, Husain, and Fatimah (A), and then said: "I am in war with those who will fight against you, and in peace with those who are peaceful to you."
The Messenger of Allah said: "He who loves al-Hasan and al-Husain, has loved me, and he who makes them angry has made me angry."
It is narrated that the Messenger of Allah said: "I named Hasan, Husain and Muhsin, the names of the sons of Aaron (Haroon) who were: Shubbar, Shubair, and Mushbir."
Anas ibn Malik Narrated: “When Allah’s Messenger (S) was asked which member of his family was the dearest to him, he replied, Al-Hasan and al-Husain. He used to say to Fatimah, Call my two sons to me and then would sniff and cuddle them.”