Sahih Muslim Book 4, Hadith Number 1489.
Chapter : The prayer of travellers and its shortening.
Ibn ‘Umar reported that he summoned (people) to prayer at a place (known as) Dajnan, and the rest of the Hadith is the same, and then said: Pray in your dwellings, but he did not repeat for the second time words of Ibn ‘Umar (Pray in your dwellings).