فَقَالَ رَسُولُ اللهِ ص … اَلَا وَ لَعَنَ اللهُ قَتَلَةَ الْحُسَيْنِ وَ مُحِبِّيهِمْ وَ نَاصِرِيهِمْ، وَ السَّاكِتِينَ عَنْ لَعْنِهِمْ مِنْ غَيْرِ تَقِيَّةٍ تُسْكِتُهُمْ.اَلَا وَ صَلَّى اللهُ عَلَى الْبَاكِينَ عَلَى الْحُسَيْنِ بْنِ عَلِيٍّ ع رَحْمَةً وَ شَفَقَةً، وَ اللَّاعِنِينَ لِاَعْدَائِهِمْ وَ الْمُمْتَلِئِينَ عَلَيْهِمْ غَيْظًا وَ حَنَقا
The Messenger of Allah (peace be upon him and his holy progeny) said,
“… May Allah curse the killers of al-Husain (peace be upon him), those who love them (the killers), those who help them and those who are silent from cursing them without dissimulation (taqiyyah) that silences them. Beware! Allah’s blessings be on those who cry for al-Husain Ibn Ali (peace be upon him) – on account of mercy and love – and on those who curse their enemies and are full of anger and fury against them (the killers)…”
References:
1. Tafseer of Imam Hasan al-Askari (peace be upon him), p. 369 under Tafseer of Surah Baqarah (2): 86
2. Al-Burhan fee Tafseer al-Quran, vol. 1, p. 268, H. 543
3. Behaar al-Anwaar, vol. 44, p. 304, H. 17