Musnad Ahmad 30:2085

'Ali ibn Ishaq narrated to us, 'Abdullah and 'Attab informed us, they said: 'Abdullah narrated to us, Yunus narrated to us, from al-Zuhri, he said: 'Abd al-Rahman al-A'raj narrated to me, from Abu Hurayrah, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever attends the funeral until it is prayed over, then for him is a qirat; and whoever attends it until it is buried—and 'Attab said: until it is finished—then for him are two qirats." It was said: "And what are the two qirats, O Messenger of Allah?" He said: "Like the two great mountains."