Musnad Ahmad 30:3012

Yahya narrated to me, from Yazid—meaning Ibn Kaysan—who said: Abu Hazim narrated to me, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him), who said: "Whoever prays over a funeral, he has a qirat. If he follows it until it is placed in the grave, then two qirats." He said: I said, "O Abu Hurayrah, what is the qirat?" He said, "Like Uhud."