It is “the promise of the Father” and when one receives this “gift of the Holy Ghost”, it is accompanied by the initial evidence of speaking a language unlearned previously, referred to as speaking in tongues as the Spirit gives utterance.
We do not teach or instruct people how to speak in tongues; the Holy Spirit gives utterance. We also stress the necessity of Purity before Power. The Gifts of the Spirit are for today. 1 Corinthians 12:1-31; 14:1-40.
Mathew 3:11; Acts 1:88; Luke 3:16; 24:49; John 1:30-33; 7:37-39; 14:16,17,26; 16:12-15; Acts 1:5-8; Mark 16:17; Acts 2:1-18; 10:44-46; 19:1-6.