Speaking in Tongues: Channeling and Xenoglossia in Judaism
Later Jewish sources also equate automatic speech with prophecy (Sha’ar ha-Gilgulim). Xenoglossia is a defining characteristic of ghostly and angelic possession in most Jewish reports after the 15th Century. Joseph Taitazak provides the first detailed account of this phenomenon. Perhaps the most famous Jew to experience it was Joseph Caro:
The eve of the Sabbath, 29th of Iyyar…I ate but little and drank the same and I studied the Mishnah at the beginning of the night…as I was reading the Mishnah the voice of my beloved knocked in my mouth and the lyre sang of itself. It [Caro’s maggid] began by saying, “The Lord is with you wherever you go [the maggid goes on to give Caro pious advice]…I speak to you as a man speaks to his neighbor…therefore my son, hearken to My voice and to that which I command you…” Afterward I slept for about half an hour and I awoke in great distress. 
The 17th Century pietist Samson Ostropoler also described the Shem ha-Doresh, the “Interpreting Name,” a similar form of automatic speech.
1. Patai, “Exorcism and Xenoglossia among the Safed Mystics,” pp. 314-25. Also see Bilu, pp. 255-257.
2. Jacob, Jewish Mystical Testimonies, pp. 138-139.