Muwatta Malik #349
Shortening the Prayer
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."
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About Muwatta Malik
This hadith is #349 from Muwatta Malik, in the Book of Shortening the Prayer. Muwatta Malik contains 1,985 hadiths across 61 books.