וַיָּ֣רָץ הַנַּ֔עַר וַיַּגֵּ֥ד לְמֹשֶׁ֖ה וַיֹּאמַ֑ר אֶלְדָּ֣ד וּמֵידָ֔ד מִֽתְנַבְּאִ֖ים בַּֽמַּחֲנֶֽה׃
And there ran a young man, and told Moses, and said: ‘Eldad and Medad are prophesying in the camp.’
Read Kabbalistic (mystical) interpretations of Numbers 11:27: Zohar and classical Jewish mystical sources, free online.