Acts 2:4 isn't about languages. It's about tongues which no man understands except God. It's undefiled, unlike languages which man can defile. Clearly a God given language.-----------
Chuss, I suggest you read the context to see that it had everything to do with language that was meant to be understood and acted upon.
(Acts 2:5-8) At that time devout Jews from every nation under heaven were staying in Jerusalem. So when this sound occurred, a crowd gathered and was bewildered, because each one heard them speaking in his own language. Indeed, they were utterly amazed and said: “See here, all these who are speaking are Gal·i·leʹans, are they not? How is it, then, that each one of us is hearing his own native language?
It then goes on to list the regions from which they came. _ Acts 2:9-11.
This reaffirms what Jesus said was the purpose of his disciples being given holy spirit.
(Acts 1:8) But you will receive power when the holy spirit comes upon you, and you will be witnesses of me in Jerusalem, in all Ju·deʹa and Sa·marʹi·a, and to the most distant part of the earth.”
Here was irrefutable evidence God had switched from backing the Jews and was now supporting the work of witnessing " to the most distant part of the earth.”
