Zayd bin Wahb narrates that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) said: "When there is a group of three (on a journey), they should appoint one of them as their leader; he will be a leader appointed in accordance with the command of the Messenger of Allah (peace and blessings be upon him)." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and they did not record it.