בְּעַמּ֣וּד עָ֭נָן יְדַבֵּ֣ר אֲלֵיהֶ֑ם שָׁמְר֥וּ עֵ֝דֹתָ֗יו וְחֹ֣ק נָֽתַן־לָֽמוֹ׃
He spoke unto them in the pillar of cloud; They kept His testimonies, and the statute that He gave them.
Read kabbalistic (mystical) interpretation of Psalms 99:7: and classical mystical sources.