Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from his father that Umar ibn al-Khattab, when he went to Makka, used to lead them in prayer and do two rakas and then say, "People of Makka,complete the prayer, we are a group travelling."
USC-MSA web (English) reference: Book 9, Hadith 21
Arabic reference: Book 9, Hadith 349