Letter, Orson Hyde to Joseph Smith Smith, London: "I retired to my bed one night ... the vision of the Lord, like clouds of light burst into my view. The cities of London, Amsterdam, Constantinople, and Jerusalem, all appeared in succession before me; and the spirit said unto me, 'Here are many of the children of Abraham whom I will gather to the land that I gave to their fathers; and here also, is the field of your labors. Take therefore proper credentials from my people, your brethren, ... and go ye forth to the cities which have been shown you, and declare these words unto Judah, and say. 'Blow ye the trumpet in the land: cry, gather together, and say, assemble yourselves and let us go into the defended cities. Set up the standard towards Zion ..."
[Grunder, Rick, Mormon Parallels: A Bibliographic Source]