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The Quba Mosque (مسجد قباء), in the outlying environs of Medina in Saudi Arabia, is the oldest mosque in the world. Its first stones were positioned by the Islamic prophet Muhammad on his emigration from the city of Mecca to Medina and the mosque was completed by his companions. Muhammad spent more than 20 nights in this mosque (after migrating) praying qasr (a short prayer) while waiting for Ali whose house was behind this mosque.
Source: http://en.wikipedia.org/wiki/Quba_Mosque