Salim bin Abdullah narrates from his father, Sayyiduna Abdullah bin Umar (may Allah be pleased with them both), that whenever a funeral passed by the Messenger of Allah (peace and blessings be upon him), he would stand until it had passed. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. This is not the text of the hadith of Sayyiduna Ibn Umar from Amir bin Rabi'ah, for that text concerns accompanying the funeral, while this one concerns standing for the funeral, despite the many differences among the narrations on this matter.