Hadith 1: The Ring of Imam Ali ibn al-Husain (عليه السلام):

علي بن إبراهيم، عن أبيه، عن علي بن معبد، عن الحسين بن خالد، عن أبي الحسن عليه السلام قال: كان على خاتم علي بن الحسين عليهما السلام " خزى وشقي قاتل الحسين بن علي عليهما السلام

Narrated that Abu al-Hasan al-Ridha (عليه السلام) said,

On the ring of Ali ibn Husain (عليه السلام) was written, "Disgraced and evil are the killers of Husain bin Ali (عليه السلام)"

[Source: al-Kafi, Vol. 6, Pg. 474]

Hadith 2: Zekr (Remembrance) of Allah (swt) and tears for Imam Husain (as):

وعن بعض مواليه قال : خرج يوما إلى الصحراء فتبعته ، فوجدته قد سجد على حجارة خشنة ، فوقفت وأنا أسمع شهيقه وبكاءه ، وأحصيت له الف مرة وهو يقول : لا إله إلا الله حقا حقا ، لا إله إلا الله تعبدا ورقا ، لا إله إلا الله إيمانا وصدقا ، ثم رفع رأسه من سجوده ، وأن لحيته ووجهه قد غمرا بالماء من دموع عينيه ، فقلت : يا سيدي ، ما آن لحزنك أن ينقضي ؟! ولبكائك أن يقل ؟! فقال لي : ويحك ، إن يعقوب بن إسحاق بن إبراهيم كان نبيا ابن نبي ، وكان له اثنا عشر ابناً ، فغيب الله واحدا منهم ، فشاب رأسه من الحزن ، وأحدودب ظهره من الغم والهم ، وذهب بصره من البكاء ، وابنه حي في دار الدنيا ، وأنا رأيت أبي وأخي وسبعة عشر من أهل بيتي صرعى مقتولين ، فكيف ينقضي حزني ويذهب بكائي ؟

Narrated from some slave of Imam Ali bin al-Husain (as) that:

"One day Imam Ali bin Husain (as) went outside towards a desert and I followed him, and I found him doing Sajdah (prostration) upon rough stones. I stopped and I was hearing his sobbing and his crying and I counted a thousand times while the Imam (as) was saying, "  لا إله إلا الله حقا حقا ، لا إله إلا الله تعبدا ورقا ، لا إله إلا الله إيمانا وصدقا  ".

He then raised his head from Sujood and his beard and face were drenched with tears from His eyes.

I said, "My Master, is it not time that your grief ends and your crying reduces? 

Imam (as) said, "Woe to you, verily Yaqoob bin Ishaq bin Ibraheem (as) was a Prophet and son of a Prophet and He had 12 sons and Allah (swt) made one of his sons to disappear, so the hair of his head turned white due to grief and his back bent due to the sorrow and his eyesight was lost due to crying, while His son was alive in the world. And I saw my Father, My brother and 17 members from my family lying dead, so how can my grief and crying end?

[Source: al-Lahoof, Syed ibn Taoos, Pg. 121 / Wasail al-Shia, Ch. 87, Hadith. 11]

Hadith 3:

From the poetry of Farazdaq about Imam Ali ibn Husain (عليهما السلام) when the Imam was near the Kaaba during Hajj:

هَذَا الَّذِي تَعْرِفُ الْبَطْحَاءُ وَطْأَتَهُ‌ وَ الْبَيْتُ تَعْرِفُهُ وَ الْحِلُّ وَ الْحَرَمُ‌

هَذَا ابْنُ خَيْرِ عِبَادِ اللَّهِ كُلِّهِمْ‌ هَذَا التَّقِيُّ النَّقِيُّ الطَّاهِرُ الْعَلَمُ

يَكَادُ يُمْسِكُهُ عِرْفَانُ رَاحَتِهِ‌ رُكْنُ الْحَطِيمِ إِذَا مَا جَاءَ يَسْتَلِمُ‌

This is one whose footsteps the valley (of Mecca) recognizes, And the House (i.e. Kaaba) and sanctuary (Haram) recognizes Him.

This is the son of the best of all Allah’s servants, this is the Pious, the Pure, the chaste/clean outstanding man.

When He comes to touch the corner of the wall of the Kaaba, it almost grasps the palm of his hand. 

[Source: Rijal al-Kashshi, Vol. 1, Pg. 130 / al-Irshad, Shaikh Mufeed, Vol. 2, Pg. 151]