Musnad Abu Ya'la al-Mawsili 140:28

Abu Ma'mar Isma'il ibn Ibrahim narrated to us, Abdullah ibn Ja'far narrated to us, from Waqid ibn Salamah, from Yazid al-Raqashi, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever dies on the day of Friday is protected from the punishment of the grave."