Musnad Abi Ya'la 3919 — a Christian man accepted Islam in the time

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that a Christian man accepted Islam in the time of the Messenger of Allah (peace and blessings be upon him). He recited Surah al-Baqarah and Surah Al Imran and used to write for the Prophet (peace and blessings be upon him). Then he became a Christian again and began to say: "Muhammad (peace and blessings be upon him) knows nothing except what I used to write for him." Allah Almighty caused him to die and the people buried him, but in the morning the earth had thrown him out. The Christians said: "This is the doing of Muhammad and his companions; because he was no longer pleased with their religion, they dug up the grave of our companion and took him out." So they dug a grave for him and made it deep, but the next morning the earth had thrown him out again. They said again: "This is the doing of Muhammad and his companions; they dug up the grave of our companion and threw him out." Then they dug a grave for him and made it as deep in the earth as they could, but the earth threw him out a third time as well. Then they became certain that this was not the doing of people, but that it was from Allah, the Mighty and Majestic, so they left him thrown out as he was.