"Imam Hasan and Hussein refused to acknowledge the authority of Yazid, for it would have been wrong to do so. For this reason, that is, in order to preserve their honour, they became martyrs."
Source:
The Collected Works of Mahatma Gandhi, Vol 7, Letter #89, Pg 122-123.
"The Collected Works of Mahatma Gandhi (Electronic Book), New Delhi, Publications Division Government of India, 1999".