The Noble Messenger Hazrat Muhammad Mustafa (s.a.w.a.s.) had a daughter Sayyida Fatima Zahra (s.a.), the Lady of Paradise and the Chief of the women of the world. On the divine instruction, he (s.a.w.a.s.) married her to the Commander of the faithful, the Lion of Allah, the Conqueror of Khyber, Imam Ali (a.s.). The Master of Martyrs, Imam Husayn (a.s.) was the second son born out of this sacred wed-lock.
When Imam Husayn (a.s.) was born, the Noble Messenger (s.a.w.a.s.) asked his aunt Hazrat Safia to bring the new born to him, to which she replied that the baby was not yet cleaned. He (s.a.w.a.s) said: “Do you want to clean him? Surely, Allah, the Exalted, has cleaned and purified him.” Hazrat Asma (s.a.) brought Imam Husayn (a.s.) and gave him to the Noble Messenger (s.a.w.a.s.). His face was lit up seeing his grandson. He took him in his arms and recited aza’n in his right ear and Iqa’ma in left ear and he wept. On inquiry from Hazrat Asma (s.a.), he said: “This baby will be martyred by a transgressing party. Allah will never grant them my intercession. ”
On the divine advice, he (s.a.w.a.s.) named the baby as “Shabbeer”, which was the name of Hazrat Ha’roon’s second son. He (s.a.w.a.s.) reared Imam Husayn (a.s.). He used to put his tongue into the mouth of Imam Husayn (a.s.), thus transmitting the piety, excellence of his own personality and knowledge to the new born. Once he (s.a.w.a.s.) was passing near Sayyida Fatima Zahra (s.a.)’s house and he heard Imam Husayn (a.s.) crying, he entered the house and said to her: “Do not you know how I am pained to hear the crying of Husain?”
As he grew, the love of the Noble Messenger (s.a.w.a.s.) grew. At numerous occasions, the Noble Messenger (s.a.w.a.s.) increased his prostration in Sala’t (nama’az) as young Imam Husayn (a.s.) had climbed onto his back and he did not want to displease Imam Husayn (a.s.). He (s.a.w.a.s.) used to carry Imam Hasan and Imam Husayn on his shoulders. At one such occasion, one of the companions remarked seeing the two grandsons holding the Prophet’s hair in their hands. He said to the two Imams that they had a nice carrier! The Noble Messenger (s.a.w.a.s.) remarked that the riders were nice!
Umar ibn Khattab reported that the Noble Messenger (s.a.w.a.s.) said: “Hasan and Husayn are the Masters of the youth of Paradise. Whosoever loves them loves me and whoever has animosity towards them is my enemy”
The Noble Messenger (s.a.w.a.s.) loved so much that he said: “Husaino Minni wa Ana Minal Husayn” “Husayn is from me and I am from Husayn” He (s.a.w.a.s.) was aware of the Great Sacrifice his grandson will give to protect Islam and his (s.a.w.a.s.)’s life time efforts and sacrifices. He (s.a.w.a.s.) was also fully aware of the “Truthfulness” of his grandsons. Consequently, he (s.a.w.a.s.) selected them to represent in the divine Ayah of Mubahila where Allah wanted to send them as the “Sons” in the Ayah 33 of Surah al-Ahza’ab which reads as: “If anyone disputes after knowledge has come to you, say, “Let us bring our sons and your sons, our women and your women, and ourselves and your selves and pray to Allah to curse the liars among us.” Consequently, Imam Hasan and Imam Husain were treated by Allah as his (s.a.w.a.s.) sons.
The supreme purity and cleanness of Imam Husayn (a.s.) along with his mother Sayyida Fatima Zahra (s.a.), his brother Imam Hasan (a.s.) and his illustrious father, the Lion of Allah, the Conqueror of Khyber, the Commander of the Faithful, Imam Ali (a.s.) was pronounced by the Noble Messenger (s.a.w.a.s.) when he assembled them under the cloak (Kisa’) and the Archangel Jibra’eel brought the Ayah of Tatheer as stated in Ayah 33 of Surah al-Ahz’ab saying “O People of the House! Allah wants to keep away all kinds of uncleanness from you and to purify you thoroughly”
When the Muslims out of gratifications and thankfulness wanted to the Noble Messenger (s.a.w.a.s.) pay for the guidance and prophetic duties he performed, Allah directed them through Ayah 23 Surah al-Shura saying”Qul La Asalakum Alaihe Ajran Illal Mawaddata Fil Qurba” “(Muhammad), say, “I do not ask you for any compensation for my preaching to you except (your) love for (my near) relatives.” The Noble Messenger (s.a.w.a.s.) said: “On my visit of Mai’raj, when I reached near the Paradise, I saw the following phrase written on its gate in gold: “There is no god but Allah, Muhammad is the beloved friend of Allah, Ali is the vali of Allah, Fatima is the servant of Allah, Hasan and Husayn are the chosen ones of Allah, and whoever has enmity with them May Allah’s curse be on them.”
The Glorious Qur’an , Bihar-ul-Anwar volume 35 page 405, Maqtal al-Husayn by al-Khwarezmi volume 1 page 14
Al-Islam.org/Encyclopedia chapter 5b/2, The Life of Imam Husain by Baqir Sharif al-Qarashi, Ansarian Publication
Kashf-ul-Mahjoob, Arhaj-ul-Matalib chapter 3 page 313, Fourteen Infallibles