Tradition 21
Through successive chain of transmitters, the Sign of Allah (Ayatullah), the Eminent Scholar Allamah Hilli relates from the Sovereign of Investigators Khwaja Nasiruddin Mohammad bin Mohammad Toosi, from the Learned Shaikh and Traditionist Burhan Mohammad bin Mohammad bin Ali Hamadani Qazwini (who had settled in Ray), from the Honourable Shaikh Muntajabuddin Ali bin Ubaydullah bin Hasan Qummi, from his father, from his grandfather, from the Noble Shaikh Abil Fath Mohammad bin Ali bin Usman Karajaki, from Mohammad bin Abbas, with his chain of narrators from Hasan bin Mahboob, who relates with his chain of narrators from Sandul, from Darim bin Firqad who says that Imam Ja'far as Sadiq (a.s) said that,
"Recite Surah al Fajr in your obligatory (wajib) and superarogatory (Nafilah) morning Prayers, for it is particularly related to Imam Husain (a.s). Have you not heard the words of Allah the Exalted in this Verse (Ayah):
O Tranquilled Soul at (complete) rest! Return to your Lord, well-pleased (with Him), (and) His being well-pleased with you."[1]
Here Imam Husain (a.s) is referred to as the
"Tranquilled Soul, well-pleased (with Allah) and His being well-pleased with him."
His companions from the family of the Prophet, are those who will be pleased with Allah on the day of Qiyamah and Allah too will be pleased with them. Verily this Surah is particularly connected to Imam Husain, his followers (Shi'ah), and the followers (Shi'ah) of the Progeny of Prophet Mohammad (s.a.w.s). The one who continuously recites this Surah will remain with Imam Husain (a.s) in Paradise in his elevated station, and verily Allah is Predominant and All-Wise."[2]
[2] S.V.Mir Ahmed Ali in his interpretation of the above Verse comments: "The human soul passes through states or stages. The state in which the soul seeks fulfilment of his lower desire, crossing the limits prescribed by Allah's laws, is called Nafsul Ammarah (the soul of lasciviousness), and the soul which reproaches against the rebellious intentions, is called Nafsul Lawwama (the self accusing soul). And the soul which has conquered all desires and surrendered
source : http://www.maaref-foundation.com