From the Bible
Acts 2:14-21 In the last days, God says, I will pour out my Spirit on all people. Your sons and daughters will prophesy, your young men will see visions, your old men will dream dreams. Even on my servants, both men and women, I will pour out my Spirit in those days, and they will prophesy.
About William J. Seymour
William Seymour died of a heart attack on September 28, 1922. He was widely considered the Father of Pentecostalism. He followed the Holy Spirit and developed a belief in the charismatic gifts (entire sanctification that manifests in prophesy, speaking in tongues, and other expressions), even before he was gifted. He needed to preach what he learned.
He was first locked out of the building to which he was called to California to speak. He eventually found a following that outgrew its building after a remarkable evening of God’s presence. He proceeded to find a place to preach and worship in L.A. It was the dirt floor in what became the famous building on Azusa St. that became the center of the Pentecostal revival.
To Seymour, tongues was not the only message of Azusa Street: “Don’t go out of here talking about tongues: talk about Jesus,” he admonished. What’s more, he rejected racial barriers that plagued the Church at that time. Blacks and whites worked together in apparent harmony under the direction of a black pastor, a marvel in the days of Jim Crow segregation. One commentator said: “At Azusa Street, the color line was washed away in the Blood.” Plus, he installed women as leaders, which was almost universally opposed at the time. Seymour dreamed that Azusa Street was creating a new kind of church, one where a common experience in the Holy Spirit tore down old walls of racial, ethnic, and denominational differences.
Much more [here].