The way you use the word biblical is interesting. If I had to guess, I would imagine you are wondering whether the Bible prescribes speaking in tongues or prayer languages for you, dausonlovi.
The way I generally use the word “biblical,” your question is not one to be debated. In my mind, biblical refers to the accounts of scripture, i.e. the stories and letter, or the mindset of the people of the Bible. So genocide is biblical, but I don’t think it’s a prescription for what you should do. Biblically, the sun moves and the earth is flat.
Anyway, speaking prayer languages is clearly in the Bible, and it is your decision whether you would benefit from its practice. Despite eponymoushipster’s response, plenty of people do continue to speak in tongues, and if you feel better for it, then do it. If the Bible says anything, I think it says you should not judge others for something like speaking in tongues.
Finally, at @eponymoushipster: how does 1 Cor 14:27–28 speak about people speaking gibberish today? it was not clear that Paul was saying glossolalia would stop after the death of the apostles to me, how do you gather that? Finally, the Roman Catholics spoke Latin because it was, at one point, the most common language that was most widely understood. The Vulgate, the Latin translation of the Bible, comes from the Latin for vulgar which means “common.” So Latin was also used by the church to allow more people to read the Bible and to let them know what it did say, instead of forcing them to learn Greek and Hebrew. Be fair.