یا ایتها النفس المطمئنة• ارجعی الی ربک راضیة مرضیة. (سوره الفجر ۲۸-۲۷)

‌(To the righteous soul will be said:) "O (thou) soul, in (complete) rest and satisfaction!

Return to your Lord, pleased and pleasing!

Imam Sadiq(pbuh) said:

《اقراوا سورة الفجر فی فرائضکم و نوافلکم فانها سورة الحسین بن علی علیه‌السّلام و ارغبوا فیها رحمکم الله تعالی》 

Read Surah Fajr in your obligatory and recommended prayers, which is Surah Hussain bin Ali (peace be upon him). And desire it (so that) God will grant you His mercy. Abu Osama, who was present in the assembly, asked: How is this surah dedicated to Hussain (peace be upon him)? The Imam (peace be upon him) replied: "Didn't you hear the word of God when he said:«یا ایتها النفس المطمئنه...»What is meant by the confident soul is Husayn bin Ali (peace be upon him) who has a calm soul that both he is from God and God is from him. is pleased

Abu Basir narrates from Imam Sadiq (peace be upon him) that "Oh, it is the self-assured soul...that is, al-Hussein bin Ali (peace be upon him)"