How did disagreements about sanctification divide early Pentecostals?

Disagreements regarding the doctrine of sanctification created a significant divide among early Pentecostals, effectively splitting the movement into two opposing camps based on their theological backgrounds.1

• Holiness Pentecostals: Early leaders such as Charles Fox Parham and William Seymour emerged from the Holiness movement, which emphasized sanctification as a distinct "second work of grace" following conversion. These Pentecostals maintained this heritage, teaching that the baptism of the Holy Spirit was a subsequent experience intended only for those who had already been sanctified.1
• Baptist-background Pentecostals: In contrast, those who came to the movement from Baptist traditions rejected this view. They taught that the baptism of the Holy Spirit was available to every believer, regardless of a prior experience of sanctification.1

This doctrinal conflict over the necessity and timing of sanctification as a prerequisite for Spirit baptism became a primary factor in driving early Pentecostals into separate denominational fellowships.1