so here we have the circumcised believers with Peter who were surprised, in fact, astounded, that the GIFT of the Holy Spirit should come upon an uncircumcised..ie not Jewish..believer in Christ.
now how did they KNOW the Holy Spirit had fallen on them?
BECAUSE THEY COULD HEAR THEM SPEAKING IN TONGUES
What did God tell them through that work of his tongue? How did they know if the words did not have any understanding? Who told them it was tongues ? What defines tongues and where can we find the foundation of the doctrine?
Note the scripture does not say how did they know they were saved, but rather how did they know the Holy Spirit had fallen once again
We are saved by a unseen work called the "baptism of the Holy Spirit" the washes away of our sins by the water of the word. It comes as he gives us his faith by which we can believe. It has nothing to do with getting wet or making sounds that have no purpose other than to self edify oneself with wonderment runs out and needs to be filled weekly or a person has run out of spirit life. .
Tongue is one of the many manners of prophecy . What does the sign of those who refuse to hear prophecy confirm ? We know prophecy confirms the word of God. It is God's word . Again what does the sign confirm ( it opposes something or the would be no need for a sign.
Again what does the sign confirm in respect to the law 1 Corinthians 14:21-22 One of those who seeks after what they call "sign gifts" but have no answers?
Find out what the signs confirms.... compare scripture to scripture ...faith to faith then the doctrine fall into place.
Seek to be led by words of faith (prophecy) not wonderment as person experiences(the sky is the limit) . Pride builders, fill me uppers.
We follow Faith not Mysticism..