The most renowned of those repentant souls was the vigorous commander Hurr, who

The most renowned of those repentant souls was the vigorous commander Hurr, who had obstructed all roads to Husayn. His transformation took place in the depths of night, nor could his soldiers believe their eyes when they beheld this man of courage trembling like a leaf in a winter storm. "But we have never seen you in fear, even in the midst of the most terrifying battles," they cried. "I find myself between heaven and hell," was Hurr's reply. "My soul cries out and cannot bear these torments of hell." In the faint light of dawn, he charged his steed towards Husayn, to express his penitence and beg forgiveness. When he had received the Imam's grace and assurance, he faced the army of Ibn Sa'd and chided them in loud tones, hoping to awaken their dormant souls. But alas! Those who were his comrades and under his command, attacked and killed him in an outburst of despicable ferocity.

Source: Abu'l-Qasim Faizi, The Prince of Martyrs, p. 33

Collected from bahaistories.com (Subject: repentance).

Various. *bahaistories.com archive*. https://bahaistories.com/subject/repentance