Hadith 6:394
Waki' narrated to us, from Shu'bah, from al-'Ala', from Sa'id ibn Jubayr, who said: I was with him at a funeral, and he heard a man saying, "Ask forgiveness for him, may Allah forgive you." So he forbade him.
حدثنا وكيع عن شعبة عن العلاء عن سعيد بن جبير قال كنت معه في جنازة فسمع رجلا يقول استغفروا له غفر الله لكم فنهاه