Musannaf Ibn Abi Shaybah 34955 — What they said on the apostate: how

Al-Walid bin Jumay' (may Allah have mercy on him) says: A governor of Umar bin Abd al-Aziz wrote to him (may Allah have mercy on him) from Yemen that a man who was a Jew had accepted Islam, then had taken up Judaism again and turned back from Islam. Umar (may Allah have mercy on him) wrote in reply: "Invite him to Islam. If he accepts Islam, let him go. If he refuses, call for the wooden plank, then invite him. If he refuses, lay him down on the wood, then invite him to Islam. If he still refuses, tie him up and place the point of a spear on his heart, then invite him to Islam once more. Then if he returns, let him go; and if he refuses, kill him." When the letter came, he was treated in this way, until the point of the spear was placed on his heart. Then he was invited to Islam and he accepted Islam, so they let him go.