בְּנֵ֣י יְהוּדָ֔ה נֹשְׂאֵ֥י צִנָּ֖ה וָרֹ֑מַח שֵׁ֧שֶׁת אֲלָפִ֛ים וּשְׁמוֹנֶ֥ה מֵא֖וֹת חֲלוּצֵ֥י צָבָֽא׃ (ס)
The children of Judah that bore shield and spear were six thousand and eight hundred, armed for war.
Read kabbalistic (mystical) interpretation of I Chronicles 12:25: and classical mystical sources.