כְּאַרְבָּעִ֥ים אֶ֖לֶף חֲלוּצֵ֣י הַצָּבָ֑א עָבְר֞וּ לִפְנֵ֤י יְהוָה֙ לַמִּלְחָמָ֔ה אֶ֖ל עַֽרְב֥וֹת יְרִיחֽוֹ׃ (ס)
about forty thousand ready armed for war passed on in the presence of the LORD unto battle, to the plains of Jericho.
Read kabbalistic (mystical) interpretation of Joshua 4:13: and classical mystical sources.