Pentecost occurred 40 days after the death and resurrection of Jesus Christ.Tongues of fire descended, upon a congregation of jewish immigrants in a conference and Peter the Apostle was actualy the person who preached on that occasion, and converted thousands of persons.Speaking inn other unlearned tongues by the jewish immigarnt occurred as evidence of Baptism of the Holy Ghost, and has remained so up till today.Apostle paul was actuall saul of tarsus and began his ministry after concersion by Jesus on the road to damascus to kill and persecute christians.He could not have preached at pentecost because he was not converted as at then. His gospels were the letters he wrote in the new testament but notGospel at penetecost.I hope you have been helped.