Imams Hasan and Hussain are the beauty of Jannah
There is a Hadith in Imam Tabarani’s M‘ojam Ausat and in Kanz Ul Ummal:
Translation: When the people of paradise will settle in paradise, it heaven will entreat: O Allah Most High, did you not promise me that you will adorn me with 2 persons? Allah Most High will answer: O paradise, did I not adorn you with Hasan and Hussain? Upon this, paradise will be proud (of itself) like a bride. (M‘ojam Ausat, Hadith No: 343; Kanz Ul ‘Ummal, Vol. 13, Pg No. 106)
Imam Hussain (May Allah be well pleased with him) is the beloved of the Holy Prophet (Sallallahu alaihi wa sallam) and of His beloved daughter, Hadhrat Fatima (May Allah be well pleased with her). To express the close relationship between tem, the Holy Prophet (Sallallahu alaihi wa sallam) said:
Translation: Hussain is though me and I am with Hussain. (Jame' Tirmidhi, Vol. 2, Pg No. 218)