The Initial Physical Evidence of the Baptism in the Holy Ghost
The baptism of believers in the Holy Ghost is witnessed by the initial physical sign of speaking with other tongues as the Spirit of God gives them utterance.
Acts 2:4 – And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
The speaking in tongues in this instance is the same in essence as the gift of tongues, but is different in purpose and use.
1 Corinthians 12:4-10 – Now there are diversities of gifts, but the same Spirit. 5 And there are differences of administrations, but the same Lord. 6 And there are diversities of operations, but it is the same God which worketh all in all. 7 But the manifestation of the Spirit is given to every man to profit withal. 8 For to one is given by the Spirit the word of wisdom; to another the word of knowledge by the same Spirit; 9 To another faith by the same Spirit; to another the gifts of healing by the same Spirit; 10 To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues:
1 Corinthians 12:28 – And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.