Musnad Ahmad 16:5

'Affan narrated to us, Hammad informed us, from al-Hajjaj ibn Artah, from Muhammad ibn 'Ali, from al-Hasan ibn 'Ali, that a funeral procession passed by them. The people stood up, but he did not stand up. Al-Hasan said: "What have you done? The Messenger of Allah (peace and blessings of Allah be upon him) only stood up out of annoyance at the odor of the Jew."