فَقَالَ لَهُ الصَّادِقُ ؑ وَ لَا كَيَوْمِ مِحْنَتِنَا بِكَرْبَلَا وَ إِنْ كَانَ كَيَوْمِ السَّقِيفَةِ وَ إِحْرَاقِ الْبَابِ عَلَى أَمِيرِ الْمُؤْمِنِينَ وَ فَاطِمَةَ وَ الْحَسَنِ وَ الْحُسَيْنِ وَ زَيْنَبَ وَ أُمِّ كُلْثُومٍ وَ فِضَّةَ وَ قَتْلِ مُحَسِّنٍ بِالرَّفْسَةِ لَأَعْظَمُ وَ أَمَرُّ لِأَنَّهُ أَصْلُ يَوْمِ الْفِرَاشِ.
Imam al-Sadeq (peace be on him) said to him:
……And not like the day of our affliction in Karbala. Although the Day of Saqifa and burning by fire of the door of Ameerul Mo’meneen, al Hasan, al Hussain, Fatema, Zainab, Umm Kulsum (peace be on them) and Fizza.; and the killing of Mohsin with a kick, was greater, more calamitious and more bitter because it was the root cause of the Day of Torture (Yaum al Azaab).”
References:
1. Hidayatul Kubra, p. 417
2. Awaalem al-Uloom, vol. 11, p. 1185