Gift of speaking to someone in their language

Scripture reference

Acts 2:4 (ASV 1901)

4And they were all filled with the Holy Spirit, and began to speak with other tongues, as the Spirit gave them utterance.

Stories

The Holy Spirit enabled the Motilone evangelists to speak and understand the language of the Yuko tribe, their former enemies. As a result, the Yuko tribe embraced new life in Jesus.
The deliverance of a demon possessed woman opened the way for the establishment of a church.
The Chinese underground church is experiencing great revival, which is resulting in a great missionary movement. Some are reported having had visions like Paul's Macedonian call (see Acts 16:9–10), in which they instantaneously started speaking the language of the nation calling them.