Musnad Ahmad 30:3405

Yazid narrated to us, Muhammad informed us, from Abu Salamah, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever prays over a funeral, for him is a qirat. And whoever follows it until its burial is completed, for him are two qirats, one of them—or the smaller of them—is like Uhud."