As a fifteen-year-old from Nantyffylon, Maesteg, Wales, George became a Christian on 20 November 1904, under the ministry of Glasnant Jones, during the 1904-1905 Welsh Revival, along with his older brother Stephen.
[4] In the many churches, conventions and camp meetings where George and Stephen Jeffreys preached in the years after this, there were reports of many miraculous healings and other acts of God.
Out of this, George founded his first church in Belfast in 1914 followed by one in Monaghan in 1915, and it was in Monagan, in a meeting in the Knox Temperance Hotel on 7 January 1915, that the Elim Foursquare Gospel Alliance, as it is officially known, was born.
He was persuaded to return but resigned a second time in 1940, leaving for Nottingham to found the Bible-Pattern Church Fellowship.
[13] Jeffrey's affirmed the "perfect inspiration and complete authority of the Bible, as given originally by God to men.