וַיַּ֨עַל הַמֶּ֧לֶךְ שְׁלֹמֹ֛ה מַ֖ס מִכָּל־יִשְׂרָאֵ֑ל וַיְהִ֣י הַמַּ֔ס שְׁלֹשִׁ֥ים אֶ֖לֶף אִֽישׁ׃
And king Solomon raised a levy out of all Israel; and the levy was thirty thousand men.
Rashi on I Kings
The tax consisted of. Which amounted to the wages of thirty thousand men.