William J. Seymour was the son of formerly enslaved parents, blind in one eye, and had learned in Texas from Charles Parham, whose Bible school in Topeka had taught that speaking in tongues is the biblical evidence of baptism in the Holy Spirit. Because of segregation, Seymour had listened to Parham's lectures from the corridor.
Invited to Los Angeles in 1906, he was locked out of the church that had invited him after he preached the doctrine. He continued in a house on Bonnie Brae Street, where in April the meetings broke out into the phenomena he had been preaching, and the crowds soon required a larger space. The mission moved into a plain former African Methodist Episcopal building on Azusa Street, and meetings ran there almost continuously for three years.
Two features drew comment at the time. Services were long, loud and without a fixed order, with preaching, singing, testimony and tongues arising as they came. And they were racially integrated, in a city and a decade in which almost nothing was, with black, white, Latino and Asian worshippers together and women in leadership. A visiting participant's remark that the colour line was washed away in the blood has been quoted ever since. Parham himself visited, condemned what he saw, including the racial mixing, and was excluded.