Musannaf Ibn Abi Shaybah

Hazrat Nafi' narrates that when Hazrat Asim bin Umar passed away, Hazrat Abdullah bin Umar (may Allah be pleased with them) was not present. Later, when he arrived—Ayub, the narrator, says that I think he came after three days—he said, "Show me my brother's grave." He was shown the grave, and he offered prayer over it.