Question: Was there another language in Kabbalah before Hebrew?
Answer: No. From the very beginning, Hebrew has been the only way of expressing Kabbalistic knowledge. It appeared out of a necessity to express spiritual roots, words, and actions. It exists for this sole purpose.
Conversational Hebrew should not have been used in our world at all. The fact that in Israel today Hebrew is used for writing, reading, and communication is incorrect. It never used to be like this. Kabbalistic texts have always been those written in Hebrew. Other languages were used for everything else, such as Aramaic or ancient Greek, but not Hebrew.
Hebrew is purely a language of branches that is used only for describing the spiritual forces, qualities, and actions.
From KabTVs “Fundamentals of Kabbalah,” 6/23/19