וַיֹּ֙סֶף֙ אַף־יְהוָ֔ה לַחֲר֖וֹת בְּיִשְׂרָאֵ֑ל וַיָּ֨סֶת אֶת־דָּוִ֤ד בָּהֶם֙ לֵאמֹ֔ר לֵ֛ךְ מְנֵ֥ה אֶת־יִשְׂרָאֵ֖ל וְאֶת־יְהוּדָֽה׃
And again the anger of the LORD was kindled against Israel, and He moved David against them, saying: ‘Go, number Israel and Judah.’
Read kabbalistic (mystical) interpretation of II Samuel 24:1: and classical mystical sources.