Musannaf Ibn Abi Shaybah 30925 — One who apostatizes from Islam: what

Abd al-Rahman reports: When the news of the conquest of Tustar came to Sayyiduna Umar (may Allah be pleased with him), and Tustar is the name of a region of Basrah, he asked them: "Is there any other news from afar?" They said: "A man from the Muslims joined the polytheists, so we seized him." He asked: "What did you do with him?" They said: "We killed him." He said: "Why did you not put him in a house, and lock the door on him, and feed him one flatbread each day, then ask him to repent three times? If he repented, well and good; otherwise you would kill him!" Then he said: "O Allah, I was not present, I did not order it, and I was not pleased when the news reached me."