There were two brothers in spirit, Evagrius the Deacon and Titus the Priest. They had a great and sincere love for each other, so that everyone marveled at their unanimity and boundless love. But the devil, who hates goodness and always roars like a lion, seeking someone to devour, sowed enmity between them, instilling such hatred in them that they refused to even look at each other. Many times the brothers begged them to be reconciled, but they would not listen.
When Evagrius stood in the church and Titus walked with the censer, Evagrius would run away from the incense; if Evagrius didn't, Titus would pass by without censing. And so they dwelt for a long time in the darkness of sin. They approached the Holy Mysteries—Titus without asking forgiveness, and Evagrius in anger. The enemy had armed them to this extent.
One day, this Titus fell gravely ill, and, lying near death, he began to lament his sin and sent humbly to the deacon, saying, "Forgive me, brother, for God's sake, for being angry with you." Evagrius responded with harsh words and curses. The elders, seeing that Titus was dying, brought Evagrius by force, so that he might make peace with his brother. The sick man, seeing his brother, raised himself slightly, fell prostrate at his feet, and tearfully said, "Forgive me, Father, and bless me." He, unmerciful and cruel, refused before us all, saying, "I never wish to be reconciled with him, neither in this life nor in the next." Having said this, he broke free from the elders' grasp and suddenly collapsed. We wanted to raise him, but we saw that he was already dead, and we could neither straighten his arms nor close his mouth, as if he had long since died. The sick man soon got up, as if he had never been ill.
And we were horrified by the sudden death of one and the quick healing of the other, and with much weeping we buried Evagrius, his mouth and eyes still open, and his arms stretched out.
Then we asked Titus, "What happened?" Titus told us this: "I saw," he said, "angels withdrawing from me and weeping for my soul, and demons rejoicing at my anger, and then I began to pray to my brother to forgive me. When you brought him to me, I saw an unmerciful angel holding a flaming spear, and when Evagrius did not forgive me, he struck him, and he fell dead, but he gave me his hand and raised me up." We, hearing this, feared God, who said, "Forgive, and you will be forgiven." For the Lord said, "Everyone who is angry with his brother without cause will be subject to judgment." Ephraim says, "If anyone should happen to die in enmity, then an inexorable judgment awaits such a person."
And if this Evagrius, for the sake of Saints Anthony and Theodosius, does not receive forgiveness, then woe to him, overcome by such a passion!
To Polycarp . Beware of her, brother, and give no place to the demon of wrath: whoever submits to him is enslaved by him. But go quickly and worship him who has enmity against you, lest you be handed over to an unmerciful angel. May the Lord also preserve you from all wrath. He said, "Let not the sun go down on your wrath." Glory to Him with the Father and the Holy Spirit, now and forever!
Source: https://azbyka.ru/otechnik/Zhitija_svjatykh/kievo-pecherskiy_paterik/23