The Messenger of Allah (ﷺ) said: Hussain is from me, and I am from Hussain. Allah loves whoever loves Hussain
Jami` at-Tirmidhi Book 49, Hadith 174
Narrated Ya'la bin Murrah:

that the Messenger of Allah (ﷺ) said: "Husain is from me, and I am from Husain. Allah loves whoever loves Husain. Husain is a Sibt among the Asbat." [Asbat, plural of Sibt: A great tribe. Meaning, Al-Husain would have many offspring, such that they would become a great tribe. And this has indeed occurred. See Tuhfat Al-Ahwadhi (4/341).]

حَدَّثَنَا الْحَسَنُ بْنُ عَرَفَةَ، قَالَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَيَّاشٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُثْمَانَ بْنِ خُثَيْمٍ، عَنْ سَعِيدِ بْنِ رَاشِدٍ، عَنْ يَعْلَى بْنِ مُرَّةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ حُسَيْنٌ مِنِّي وَأَنَا مِنْ حُسَيْنٍ أَحَبَّ اللَّهُ مَنْ أَحَبَّ حُسَيْنًا حُسَيْنٌ سِبْطٌ مِنَ الأَسْبَاطِ ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ وَإِنَّمَا نَعْرِفُهُ مِنْ حَدِيثِ عَبْدِ اللَّهِ بْنِ عُثْمَانَ ابْنِ خُثَيْمٍ وَقَدْ رَوَاهُ غَيْرُ وَاحِدٍ عَنْ عَبْدِ اللَّهِ بْنِ عُثْمَانَ بْنِ خُثَيْمٍ ‏.‏
Reference  : Jami` at-Tirmidhi Book 49, Hadith 174
In-book reference  : Vol. 1, Book 46, Hadith 3775
Additional References:
 
Rasulullah (ﷺ) said: 'Whoever loves Hasan and Husain, loves me; and whoever hates them, hates me.'

Reference: Sunan Ibn Majah 143

Sunan Ibn Majah 143
It was narrated that Abu Hurairah said:

"The Messenger of Allah said: 'Whoever loves Hasan and Husain, loves me; and whoever hates them, hates me.'"

حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ دَاوُدَ بْنِ أَبِي عَوْفٍ أَبِي الْجَحَّافِ، - وَكَانَ مَرْضِيًّا - عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏ "‏ مَنْ أَحَبَّ الْحَسَنَ وَالْحُسَيْنَ فَقَدْ أَحَبَّنِي وَمَنْ أَبْغَضَهُمَا فَقَدْ أَبْغَضَنِي ‏"‏ ‏
Reference  : Sunan Ibn Majah 143
In-book reference  : Introduction, Hadith 143
 
The Prophet (ﷺ) said: O Allah! Indeed, I love them, so love them, and love those who love them.'
Jami` at-Tirmidhi Book 49, Hadith 168
Narrated Usamah bin Zaid:

"I came to the Prophet (ﷺ) one night concerning some need, so the Prophet (ﷺ) came out while he was covering up something, and I did not know what it was. Once I had tended to my need, I said: 'What is this that you were covering up?' So he uncovered it, and I found it was Hasan and Husain [peace be upon them] upon his hips. So he said: 'These are my two sons, and the sons of my daughter. O Allah! Indeed, I love them, so love them, and love those who love them.'"

حَدَّثَنَا سُفْيَانُ بْنُ وَكِيعٍ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالاَ حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، قَالَ حَدَّثَنَا مُوسَى بْنُ يَعْقُوبَ الزَّمْعِيُّ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ زَيْدِ بْنِ الْمُهَاجِرِ، قَالَ أَخْبَرَنِي مُسْلِمُ بْنُ أَبِي سَهْلٍ النَّبَّالُ، قَالَ أَخْبَرَنِي الْحَسَنُ بْنُ أُسَامَةُ بْنِ زَيْدٍ، قَالَ أَخْبَرَنِي أَبِي أُسَامَةُ بْنُ زَيْدٍ، قَالَ طَرَقْتُ النَّبِيَّ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ فِي بَعْضِ الْحَاجَةِ فَخَرَجَ النَّبِيُّ صلى الله عليه وسلم وَهُوَ مُشْتَمِلٌ عَلَى شَيْءٍ لاَ أَدْرِي مَا هُوَ فَلَمَّا فَرَغْتُ مِنْ حَاجَتِي قُلْتُ مَا هَذَا الَّذِي أَنْتَ مُشْتَمِلٌ عَلَيْهِ قَالَ فَكَشَفَهُ فَإِذَا حَسَنٌ وَحُسَيْنٌ عَلَيْهِمَا السَّلاَمُ عَلَى وَرِكَيْهِ فَقَالَ ‏ "‏ هَذَانِ ابْنَاىَ وَابْنَا ابْنَتِي اللَّهُمَّ إِنِّي أُحِبُّهُمَا فَأَحِبَّهُمَا وَأَحِبَّ مَنْ يُحِبُّهُمَا ‏"‏ ‏.‏ هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ ‏.
Reference  : Jami` at-Tirmidhi Book 49, Hadith 168
In-book reference  : Vol. 1, Book 46, Hadith 3769
Additional References:
 
The Prophet (ﷺ) descended the Minbar and said: I could not bear patiently anymore until I interrupted my talk and picked them up.
Jami` at-Tirmidhi Book 49, Hadith 173
Narrated Buraidah:

"The Messenger of Allah (ﷺ) was delivering a Khutbah to us when Al-Hasan and Al-Husain [peace be upon them] came, wearing red shirts, walking and falling down. So the Messenger of Allah (ﷺ) descended from the Minbar and carried them, and placed them in front of him. Then he said: 'Allah spoke the Truth: Indeed, your wealth and your children are a trial (64:15). I looked at these two children walking and falling down, and I could not bear patiently anymore until I interrupted my talk and picked them up."

حَدَّثَنَا الْحُسَيْنُ بْنُ حُرَيْثٍ، قَالَ حَدَّثَنَا عَلِيُّ بْنُ حُسَيْنِ بْنِ وَاقِدٍ، قَالَ حَدَّثَنِي أَبِي، قَالَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ بُرَيْدَةَ، قَالَ سَمِعْتُ أَبِي، ‏:‏ بُرَيْدَةَ يَقُولُ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَخْطُبُنَا إِذْ جَاءَ الْحَسَنُ وَالْحُسَيْنُ عَلَيْهِمَا السَّلاَمُ عَلَيْهِمَا قَمِيصَانِ أَحْمَرَانِ يَمْشِيَانِ وَيَعْثُرَانِ فَنَزَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم مِنَ الْمِنْبَرِ فَحَمَلَهُمَا وَوَضَعَهُمَا بَيْنَ يَدَيْهِ ثُمَّ قَالَ ‏"‏ صَدَقَ اللَّهُ ‏:‏ ‏(‏ إنَّمَا أَمْوَالُكُمْ وَأَوْلاَدُكُمْ فِتْنَةٌ ‏)‏ نَظَرْتُ إِلَى هَذَيْنِ الصَّبِيَّيْنِ يَمْشِيَانِ وَيَعْثُرَانِ فَلَمْ أَصْبِرْ حَتَّى قَطَعْتُ حَدِيثِي وَرَفَعْتُهُمَا ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ إِنَّمَا نَعْرِفُهُ مِنْ حَدِيثِ الْحُسَيْنِ بْنِ وَاقِدٍ ‏.‏
Reference  : Jami` at-Tirmidhi Book 49, Hadith 173
In-book reference  : Vol. 1, Book 46, Hadith 3774
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