Aban bin Uthman (may Allah have mercy on him) saw a funeral and stood up, and said that once Sayyiduna Uthman (may Allah be pleased with him) saw a funeral and he also stood up, and he said that once the Prophet (peace and blessings of Allah be upon him) saw a funeral and he also stood up.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 457
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف، زكريا بن أبى زكريا مترجم فى التعجيل ، وقال عنه: مجهول