Prophet ﷺ said about Sayyidina al-Husayn (Alaihi Salaam), to show how close Husayn was to him:
Al-Husaynu minnee wa anaa mina ’l-Husayn, ahabb-Allahu man ahabb Husayna, Husayn sibtun min al-Asbaat.
Husayn is from me and I am from him! May Allah love whomsoever loves Husayn!
Also it is said that Sayyidina al-Hasan (Alaihi Salaam) looked like Prophet ﷺ from his head to his chin, similar to Prophet ﷺ, and from the neck down Sayyidina al-Husayn (Alaihi Salaam) looked like the Prophet ﷺ, so together, Sayyidina al-Hasan (Alaihi Salaam) and Sayyidina al-Husayn (Alaihi Salaam) look as a whole like the Prophet ﷺ. May Allah (swt) make us to meet them in Paradise and to be with Prophet ﷺ and his Family (Alaihi Salaam)! Look how much they suffered and how much ni`ama we are in.
-Shaykh Hisham Kabbani