It is interesting to note that FF Bosworth was one of the founders of the
Assemblies of God denomination but he left this denomination over the
Teaching that the AOG embraced that tongues was the initial evidence
of the Baptism of the Holy Spirit. There are many Spirit filled believers
that speak in tongues that agree with Bosworth, and I am one of them.
Below is an excerpt from Bosworth's book "Do All Speak With Tongues?"
After eleven years in the work on Pentecostal lines, during which time it has been my pleasure to see thousands receive the precious Baptism in the Holy Spirit, I am absolutely certain that many do not receive the manifestation of speaking in tongues. And I am just as certain, on the other hand, that many who seemingly speak in tongues, are not, nor ever have been, baptized in the Spirit.
The day of Pentecost witnessed the grandest and most effective display of the gift of tongues that the world has ever seen. God’s purpose was that it should be "a sign,”* not to believers, but to the unbelieving Jews dwelling at Jerusalem "out of every nation under heaven.”* And God’s purpose was most wonderfully realized, for three thousand unbelieving Jews were, by the fact that these Galileans spoke in their own language, forced to believe that Jesus was actually the Messiah. Perhaps there was no other sign that God could have manifested so effectively under these circumstances as the speaking in tongues.
Eight years later Peter and the six Jewish brethren who accompanied him to the household of Cornelius were, with all other Jews, unbelievers as to the Gentiles being included in the privileges of the Gospel. So God made the gift of tongues a sign to them, thus convincing them to their astonishment, that "God also to the Gentiles [hath] granted repentance unto life.”* Later when Peter returned to Jerusalem, he rehearsed the matter from the beginning and closed his argument by saying, "As I began to speak, the Holy Ghost fell on them, as on us at the beginning.”* If all the multiplied thousands saved and baptized with the Spirit during that wonderful revival period of eight years between the second chapter and the tenth chapter of Acts; if they all spoke in tongues, why did Peter say "As on us at the beginning”? He could just as well have said, "As He has been baptizing all since the beginning.” If it was well-known that all received the gift of tongues with the baptism during those eight years, why should he point back to the time they spoke in tongues on the day of Pentecost?
The facts are that it is unscriptural to teach that they all received that one manifestation, and this is the force of all of Paul’s argument to the Corinthians. He uses the illustration of the human body and its members and asks, "If the whole body were an eye, where were the hearing?”* etc. And then to make it still more emphatic, he asks, "Are all apostles? are all prophets? are all teachers? are all workers of miracles? Have all the gifts of healing? do all speak with tongues? do all interpret?”* Of course the answer to each of these questions is "No!” In other words, Paul is distinctly saying that all are not teachers, and all do not speak in tongues.
Teaching that tongues is the evidence of the baptism in the Spirit makes it a sign to believers, whereas Paul distinctly says that it is not a sign to the believer, but to the unbeliever (1 Corinthians 14:22). If made a sign to the seeker for the baptism it not only leaves no place for faith, but on the other hand destroys faith already divinely given. After God has most powerfully baptized the seeker, someone will tell him that he has not yet received the Holy Ghost because he did not speak in tongues. This destroys his faith and sends him home discouraged, to continue his seeking, as some have for several years.
It is a notable fact that many of the deepest and best teachers and preachers in the Pentecostal movement have the poorest success in getting seekers through to speaking in tongues. The reason is they are too conscientious to use the "Glory-glory-say-it-a-little-faster” and other similar methods which have made some of the shallowest and most fanatical workers, apparently most successful. Proper instruction will in every instance bring the baptism in the Holy Spirit, but it will not always bring the manifestation of tongues.
[Fred F. Bosworth; Do All Speak With Tongues””An Open Letter to the Ministers and Saints of the Pentecostal Movement]
