Cult leaders in William Branham's "Message" cult of personality have for decades been aware that William Branham faked "speaking in tongues" during a 1959 sermon. During the sermon, Branham used words and phrases -- claiming not to know them or what they meant -- as the "spirit" came on him.

Yet those same words and phrases were used in several sermons prior, and William Branham himself explained where, when, and why he learned them.

Speaking in Tongues:
https://william-branham.org/site/research/topics/speaking_in_tongues