The first thing that the Prophet (may the peace and blessings of Allah be upon him) did immediately upon his arrival in Madina was to build a mosque to observe the rituals of Islam that had always been fought, and to offer prayers linking the Muslim to the Lord of the Worlds.
Allah said ( interpretation of the meaning ) : { Do not stand [for prayer] within it - ever. A mosque founded on righteousness from the first day is more worthy for you to stand in. Within it are men who love to purify themselves; and Allah loves those who purify themselves.} Quran ( 9 : 108 )

##The_Prophet_migration
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