I often make reference to praying in tongues or praying in the Spirit so this page is dedicated to that subject.
This is another one of those terms that only make sense if I tell you what the Bible says about it.
Shortly after Jesus was raised from the dead and then left this earth’s realm to take His place in the heavenlies so He could make a way for us believers to have access to all that belongs to Him, there was an explosive prayer meeting in what’s called the “upper room”. There all the disciples, and all those with them, were baptized, (immersed) in the Spirit of God and spoke out in unknown (to the individuals) tongues (languages) that the Spirit of God gave them. All this is described in Acts 2 of the Bible where, immediately following this immersion and Peter’s subsequent preaching, about it, 3000 people were added to this first church. The baptism literally fully dunked the disciples into the power of God which in turn affected 3000 people to be born again.
“Praying in tongues” is evidence – just like when anyone is baptized (immersed) in water the evidence is that they come out all wet, so, the evidence of being baptized (immersed) in the Spirit of God is that you come out speaking in tongues. The most wonderful thing – it’s for ALL.
ACTS 2:2-29 Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. The promise is for you and your children and for ALL who are far off—for ALL whom the Lord our God will call.” NIV (See also JOEL 2:28-29,32)
Below is an excellent link that will give more understanding, and the way to receive this immersion (baptism) into the Spirit of God, His power and speaking in tongues.