Hawzah News Agency – The merciful prophet of Islam (pbuh) says:

أمّا الحُسَينُ فَإنَّهُ مِنّي وَهُوَ ابني وَوَلَدي وَخَيرُ الخَلقِ بَعدَ أخيهِ وَهُوَ إمامُ المُسلِمينَ وَمَولى المُؤمِنينَ وَخَليفَةُ رَبِّ العالَمينَ وَغياثُ المُستَغيثينَ وَكَهفُ المُستَجيرينَ وَحُجَّةُ اللَّهِ عَلى خَلقِهِ ‏أجمَعينَ وَهُوَ سَيِّدُ شَبابِ أهلِ الجَنَّةِ وَبابُ نَجاةِ الاُمَّةِ أمرُهُ أمري وَطاعَتُهُ طاعَتي مَن تَبِعَهُ فَإنَّهُ مِنّي وَمَن عَصاهُ فَلَيسَ مِنّي.

'As for Husayn, he is from me, he is my son, my offspring, and the best of all mankind after his brother. He is the Imam of the Muslims, the Master of the Believers, the vicegerent of the Lord of the Universe, the helper of those who seek assistance, the refuge of those who seek refuge, the proof of Allah on all of His creation. He is the chief of the youth of Paradise, the door to the community's salvation. His command is my command. Obedience to him is obedience to me. Whoever follows him is associated with me and whoever disobeys him cannot be associated with me.'

Source: Amali al-Saduq, no. 101