Shu'ayb bin al-Layth narrates from his father; this hadith is like the narration of Qutaybah, with this addition: When the Messenger of Allah (peace and blessings be upon him) saw a funeral he would stand up for it; then he (peace and blessings be upon him) gave up standing and would not stand for a funeral.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6885