It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "Do not reduce your prayer (that is, do not shorten it) in your pastures and the places where your livestock graze, and do not go to the villages of the Sawad (of Iraq) for your needs and say: 'We are travellers.' The traveller is only the one who goes from one horizon to another."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9423