Musannaf Ibn Abi Shayba 26:239

'Abd al-A'la narrated to us, from Ma'mar, from al-Zuhri, from Sa'id, that 'Umar wrote regarding the matter of the grandfather and the *kalala* (a person who leaves no direct descendants or ascendants) on a shoulder blade. Then he began to seek the guidance of his Lord. When he was stabbed, he called for the shoulder blade and erased it. Then he said, "I had written a document regarding the grandfather and the *kalala*, and I have decided to return you to what you were upon." And they did not know what was on the shoulder blade.